Distance travelled

A car travells certain distance taking 7 hrs in forward journey, during the return journey increased speed 12km/hr takes the time 5 hrs. What is the distance travelled.

a) 210 KMs
B) 30 KMs
c) 20 KMs
d) None Of these

Questions by shubhada.1976

Showing Answers 1 - 3 of 3 Answers

phdsong

  • Sep 2nd, 2008
 

Increased speed by 12Km/hr?
or Increased speed to 12Km/hr?

If first, none. If second, it takes 5 hours to return with 12Km/hr. So, 5 multiply 12 equals 60 Km. Since it is round trip, it is going to be 120 km.

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rrsain

  • Sep 12th, 2008
 

suppose speed is X kmph, so distance covered in 7 hours is equal to 7X kms. now speed is increased to 12 kmph, and same distance is covered in 5 hours so total distance covered is equal to (X+12)5 kms.
 so        7X= (X+12)*5
  or  X= 30
  so distance travelled is 7* 30= 210kms.


regards
rrsain

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