Question

A train travels at a speed of 60 kilometres per hour for 0.5 hours at 30 kilometres per hour for the next 0.2 hours and then at 70 kilometres per hour for the next 0.7 hours what is the average speed of the train

Answer 1

a train travels 60 km/hr for 0.5 hour, 30 km/hr for next 0.2 hr and 
then 70 km/hr for next 0.7 hr
what is the average speed for the trip?
:
Find the total distance of the trip; (dist = speed * time)
d = (60*.5) + (30*.2) + (70*.7)
d = 30 + 6 + 49


d = 85km
:
Find the total time for the trip
t = .5 + .2 + .7
t = 1.4 hrs
:
Find the av speed (a = d/t)
=88/1.4
a = 62.85 ~ 60 km/hr av speed for the trip

Answer 2

Answer:

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