Question

Rachit starts his journey to a certain place by the car at 9 a.m. and reaches the place at 1 p.m. if he drives the car at the speed of 30 kilometre per hour how much should increase the speed so that he can reach the place 12 noon

Answer 1

It took Rachit 4 hours to reach the place at the speed of 30 kmph(uniform).
So, the place is 4*30=120 km away.
If he starts from rest again and wants to reach the place by 12 noon,i.e., 12 p.m.
He should drive at 40 kmph ∵120/3=40.