a man standing near a railway track observes that a train passes him in 80 seconds but to pass by a 180m long bridge the same train takes 200 seconds. find the speed of the train
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Answer: 4.5 m/s
Step-by-step explanation: 80 s are taken in covering distance equal to length of the train say l.
crossing 180 m time taken 200 s
crossing bridge = l + 180 + l m
so train passes 180 m in 200 - 160 s =40 s
speed = 180/40 = 4.5 m/s
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