Question

A man takes 5 hours to travel from city A to city B with a speed of 40 km per hour. If he took only 4 hours to cover the same distance while returning back to city A, what was his speed in return journey?

• A. 40 km per hour
• B. 60 km per hour
• C. 50 km per hour
• D. 30 km per hour

Answer 1

The correct option is C 50 km per hour

Total time taken to travel from city A to city B
= 5 hours

Total distance covered from city A to city B in 1 hour
= 40 km

Total distance covered from city A to city B in 5 hours
= 40 $\times$ 5
= 200 km

Now for return journey,

Distance covered will be same

Distance covered = 200 km

Total time taken = 4 hours

Distance covered by man in return journey in 4 hour
= 200 km

Distance covered by man in return journey in 1 hour
= 200 $÷$ 4
= 50 km

Distance covered in 1 hour = 50 km

​​​​​​​Therefore,
Speed = 50 km per hour