A car is journied a certain distance in 7 hrs in forward journey in the return journey increased speed 12km/hr takes the times 5 hrs. what is the distance

2 Answers on this Question

1. let car speed =x
   after 7 hour journey the car cover all distance
   means Distance= Speed*time=7x km
   in the return journey that car increase speed 12km/hour
   cover same distance in 5 hours
   maans distance=(x+12)*5 km
   both case distance is same
   7x=(x+12)*5
   =>7x=5x+60
   =>2x=60
   =>x=30km/hour
   speed=30km/hour
   distance=30*7=210km

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2. let d distance and s be speed.
   d/7 = x and d/5 = x+12
   solving we get d=210.

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