21.
A 60m long train moving on a staright level track passes a pole in 5s, find (a) the speed of train. (b) the time it will tal
to cross a 540 m long bridge.
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Answer:
speed of train is d/ t = 60/5=12 m/ s
now according to the question.
the time taken by the train to cross the bridge is 540 / 12 = 45 sec.
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