Question

A car travels a certain distance taking 7 hrs in forward journey, during the return journey increased speed 12km/hr takes the times 5 hrs. What is the distance traveled

(a) 210 kms (b) 30 kms (c) 20 kms (c) none of these

Answer 1

distance = speed * time

let speed be x

1. time = 7 hrs

speed = x

distance = 7x

2.time = 5 hrs

speed = x+12

distance = 5x+60

distance for journey would be same so equating distance

7x=5x+60

7x-5x=60

2x=60

x=30 kmph

distance = 30 * 7 = 210 km