Question

A train travel distance of the first 20 km in 2 hours after that 15 km in 3 hours and remaining 37 km in 4 hours, then find the average speed of the train in the whole journey.
1. 10 km/h
2. 8 km/h
3. 9 km/h
4. 12 km/h

Answer 1

Correct Answer - Option 2 : 8 km/h

Formula used:

Average speed = (total distance)/(total time)

Calculation:

Average speed = (20 + 15 + 37)/(2 + 3 + 4)

⇒ Average speed = 72/9 = 8

∴ The average speed of the train is 8 km/h