A person travels a distance of 25 km at a speed of 75 km/hr and then comes back at twice the speed. How many minutes did he take in total?

Question: A person travels a distance of 25 km at a speed of 75 km/hr and then comes back at twice the speed. How many minutes did he take in total?

Solution:
Given that,
distance = 25 km,
speed = 75 km/hr.
we know,
Time = distance/speed
∴ Time = 25/75
= 1/3 hour
= 20 minutes. [1hour = 60 minutes]
As the speed becomes twice,
Speed = 2 × 75
= 150 km/hr.
Now
Time = 25/150
= 1/6 hour
= 10 minutes. [1hour = 60 minutes]
∴ Total time = 20 + 10
= 30 minutes.