Jake has timed that a train takes 40 seconds to cross the platform he is standing on while it takes just 15 seconds to cross him. if the average speed of train is 90 k mph, what is the length of the platform in meters?
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To cross Jake the train took 15 sec.
Speed of train in m/sec = 90 × 5/18 = 25 m/sec.
Length of train = 25 × 15 = 375 m.
Time taken to cross platform is 40 sec.
Distance travelled by train in 40 sec = 40 × 25 = 1000 m.
Length of platform = distance travelled - length of train.
= 1000 - 375 = 625 m .
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