A train passes 300 m long platform in 30 s and it crosses a signal on the station in 12 s. Find:
a) the speed of the train in km/h.
b) the length of the train.
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Answer:
Let length of train = L metres and speed = S m/s
Train covers (300 + L) metres in 30 seconds.
=> Speed of train = (300 + L)/30
Further, train covers L metres in 12 seconds.
=> Speed of train = L/12
Now, (300 + L)/30 = L/12
=> 3600 + 12L = 30L
L = 3600/18 = 200 m
Speed = 200/12 x 18/5 = 60 kmph
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