Question

A train travels at a speed of 60 km/h for 0.52 h, at
30 km/h for the next 0.24 h and then at 70 km/h for
the next 0.71 h. What is the average speed of the
train ?​

Answer 1

Find the total distance of the trip; (dist = speed * time)

d = (60*.52) + (30*.24) + (70*.71)

d = 31.2 + 7.2 + 49.7

d = 88.1 km

:

Find the total time for the trip

t = .52 + .24 + .71

t = 1.47 hrs

:

Find the av speed (a = d/t)

a = 88.1 / 1.47

a = 59.932 ~ 60 km/hr av speed for the trip