Question

A man travels from A to B at 4 km/h and reaches his office 30 min late. If the speed
had been 5 km/h, he would have reached 5 min early. Find the distance of A to B.​

Answer 1

Step-by-step explanation:

To find the distance,

Let distance = x km.

Time taken at 3 kmph : dist/speed = x/3 = 30 min late.

time taken at 4 kmph : x/4 = 40 min earlier

difference between time taken : 40-(-30) = 70 mins = 70/60 hours.

x/3- x/4 = 70/60

x/12 = 7/6

x = 14 km.

So option B is the correct answer.