9. A passenger train, 150m long, passes a railway platform, 200 m long, in 35 seconds.
Find (i) speed of the train in km/hr.
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Answer:
distance = length of the train + the length of the platform
that's mean distance = 150m+200m=350m
now given time is 35seconds
formula speed=distance/time
speed =350/35
speed of train is= 10 m/sec
but we have to answer the value of speed in km/hr so we need to convert the speed.
formula to convert speed(from m/s) to speed in km/hr
formula = speed(in m/s)*18/5
= 10*18/5
=36km/hr
answer 36km/hr
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