Question

A train travels the first 15 km at a uniform speed of 30km/h ;the next 75 km at at a uniform speed of 50 km/h and the last 10km at a uniform speed of 20 km/h . calculate the average speed for the entire train journey?

Answer 1

Answer:

Average speed of train is 40km/h

Explanation:

Given :-

First 15 km at a uniform speed of 30km/h.

Next 75km at at a uniform speed of 50km/h.

Last 10km/h at a uniform speed of 20km/h.

Time 1st = distance /speed = 15/30

Time 2nd = distance /speed = 75/50

Time 3rd = distance /speed = 10/20

Total distance = 15km+75km+10km = 100km

Hence,

Average speed of train is 40km/h

Hopefully understandable ^-^.