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Albert and Fernandes have two leg swimming race. Both start from opposite ends of the pool. On the first leg, the boys pass each other at 18 m from the deep end of the pool. During the second leg they pass at 10 m from the shallow end of the pool. Both go at constant speed but one of them is faster. Each boy rests for 4 seconds at the end of the first leg. What is the length of the pool?
shraisy
- Sep 29th, 2011
@gaurav4607
will we not consider the time they took for rest at each end . i.e 4 seconds ?gaurav4067
- Dec 8th, 2010
The solution is :Let the length of swimming pool be : Dlet their speed be x and y. So acc. to ques the fast swimmer (let x) would start from shallow end. Thuslet they first meet after time: t1x ....
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I left home early in the morning and returned back in the afternoon. The speciality that i noted was that when i returned, the minute hand was where the hour hand was in the morning and the hour hand was 2 minutes away from where the minute needle was in the morning. When did i return?
hema
- Dec 19th, 2005
He arrived after 6 and a half hour
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If a farmer divides all the mangoes he has into rows of 3,5,7,9 he finds there isstil one left but when he divides it into rows of 11 he finds none is left. what is thetotal no of mangoes
madhuri
- Jan 22nd, 2007
lcm of 3,5,7,9 is 945...if we divide 946 it will have remainder 1 but if we divide by 11 no remainder....
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Time Puzzle
2 and a half artist with 2 and a half canvases and two in two and a half hours can paint 2 and a half drawings. How many artist are needed for 24 canvases and 24 drawings in 24 hours?
aries.mishra
- Jun 25th, 2010
Answer is 2 and a half artists. This question usually asked similarly as that one cloth takes one hour to be dry then how much time will 10 cloths take to be dry?Mostly people confuse and say 10hrs. this is same question.Ans is 2.5 artists
prateek katta
- Feb 19th, 2010
2 artists are needed.
(2 artists in 2.5 hours can make 2.5 paintings.
In 22.5 (2.5*9) hours they will make 22.5 paintings.
In next one and a half hour they will make 1.5 paintings(this can be found by chain rule).
So in 24 hrs 2 artists will make 24 paintings) -
Price of Cow
A man sold two cows for Rs. 210 at a total profit of 5 %. He sold one cow at a loss of 10% and another at a profit of 10%. What is the price of each cow?
khushbu.kathiriya
- Oct 27th, 2010
Total 5% profit on Rs.210 i.e. Original Price=200Rs.Suppose one cow is of X Rs.i.e. another is of 200-X Rs.now loss of 10% on X =10x/100& profit of 10% on (200-x) =(200-x)10/100i.e.x-[...
S.P.K.A.
- Sep 28th, 2010
The cost of 2 cows is 200.Overall Profit is 10 Rs..The cost of 1st cow (sold for 10% loss) is 50 Rs. i.e. loss=5 RsThe cost of 2nd cow (sold for 10% profit) is 150Rs. i.e. profit=15 Rs.
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Given two billion distinct points on a plane such That no three are collinear. I color any half of them red and the Remaining blue. Is it always possible for you to join each red point to one (and Only one) blue point by means of line segments such that no two line segments Intersect?
abhinavmishra85
- Dec 9th, 2009
Yes, but these line segments will have one common end point that is the blue point.
manojthesingham
- Dec 4th, 2009
____________________red___blue___________________red_____blue__________________red_______blue_________________red_________blue________________red___________blue_______________red_____________blue_____...
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2 persons have the same no of marbles at starting.after that 1st person gains 20 marbles from 2nd..n later 1st loses 2/3rd of wat he had... now 2nd has 4 times as many marbles as 1st...wat r the initial no of marbles tat each of them had?
satyam dubey
- Aug 31st, 2006
According to my opinion bala is correct
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Light glows for every 13 seconds . Howmany times did it between 1:57:58 and 3:20:47 am
Shubham Pramod Mirase
- Oct 25th, 2020
384 is the correct answer
detallica
- Jun 3rd, 2008
I have calculated the time difference in seconds , it comes out to be 4969 secs , since the light glows in 13 secs so it will glow 382.23 i.e 383 times approx.pls check the answer , iam not sure .the first guy had added an extra one in 383 , why ?
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We all know that the hour hand and the minute hand on a clock travel at diff speeds. However, there r certain occasions when they r exactly opposite each other. Can u give a simple formula for calculating the times of these occasions?
Rishi_143love
- Jul 25th, 2008
For exactly oppodite orientations,the angle between the must be an odd multiple of"pi"Now,angular speed of minute hand=2pi &n...
shashank_tangwan
- Mar 1st, 2007
CORRECTION :There is a discrepancy of 5/11 mins in overlapping and it gains by this much time in 65 mins .................. Which means that :correct clock takes 65 & 5/11 mins to overl...
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Binary Numbers (5 Questions)
In a certain code, the symbol for 0 (zero) is. * and that for 1 is $. The numb.:rs greater than 1 are to be written only by using the two symbols given above. The value of the symbol for 1 doubles itself every time it shifts one place to the left.
(For example, 4 is written as $**; and; 3 is written as $$)
(1) 260 can be represented as:
A) $****$**
B) $$*$$$$$
C)...shefali
- Sep 1st, 2015
(4) 30^2 can be represented as:
A) ($$*$$ ) $*+ $*$*$$*$
B) ($$*$$ ) $* + $$****$
C) ( $$*$$ ) $$ + $*$****
D) ( $$*$$ ) $$ + $*$**$akshata dasar
- Apr 3rd, 2010
(6).D)$*****$**explanation:256+0+0+0+0+0+4+0+0=260 (7).c)$*$$*$**/$$**$$explanation:180/51=60/17 (8).b)$*$**-$$explanation:20-3=17 (10).c)$$$*$explanation:18.7+10+.3=29
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A train blows a siren one hour after starting from the station. After that it travels at 3/5th of its speed it reaches the next station 2 hours behind schedule. If it had a problem 50 miles farther from the previous case,it would have reached 40 minutes sooner. Find the distance between the two stations
nav_cusat
- Mar 8th, 2008
It is a simple logical ques. suppose the train takes t time to cover the dis. But when there occurs a problem , whether at a dis after travelling for 1 hour or further 50 miles; it must take more than time t(as it is its normal travelling time.).
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How old is the mother puzzle
The sum of their (father, mother and son) ages is 70. The father is 6 times as old as the son.When the sum of their ages is twice 70, the father will be twice as old as the son.How old is the mother?
kiranaar10728
- Jun 18th, 2008
let father's age be 6x and son's age be x.le mother's age be yso 6x+y+x=70 given =>7x+y=70............(2) let their sum be 140 after h years.so age of father at that t...
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3 Policemen and 3 thieves had to cross a river using a small boat.
3 policemen and 3 thieves had to cross a river using a small boat. Only two can use the boat for a trip. All the 3 policemen and only 1 thief knew to ride the boat. If 2 thiefs and 1 policeman were left behind they would kill him. But none of them escaped from the policemen. How would they be able to cross the river?
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In India, water lillies grow extremely rapidly in the ponds. If the growth enlarged so much that each day it covered a surface double that which it filled the day before, so that at the end of the 20th day if entirely covered the pond, in which it grew, how long would it take water lillies of the same size at the outset and at the same rate of growth to cover the same pond?
zhangchaofan
- Nov 10th, 2009
Need 21 days. Because, the double increase in each day. So, cover the same size of pond is equal to the double increase.
shahdadpuri
- Jun 24th, 2008
We already have lillies that have covered the pond in 20days... now they would cover another pond of double the size in one more day... hence another pond of same size would be covered in half a day.
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Two clocks are ticking, 1 gains 10 mins in 1 hour & other loses 10 mins in 1 hour. At what time 2 clocks reach the same time?
Challenging Puzzles
Ans