A man drove 90km in 1 hour How long did he take to drive 30k

A man drove 90km in 1 hour. How long did he take to drive 30km?

Solution

A man drove 90km in 1 hour.
So the speed of the man = 90kmph
Time required to travel a distance of 30 km = (Distance)/(speed)
= 30/90 hour
= 1/3 hour
= (1/3)*60
= 20 min