a man is standing on a railway bridge which is 180 m long.he finds that train crosses a bridge in 20 sec but himself in 8 sec. find the length of the train and its speed?
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the train,
the train,in 20 sec crosses 180 m
the train,in 20 sec crosses 180 m so, in 1 sec it crosses 180/20 =9 m
the train,in 20 sec crosses 180 m so, in 1 sec it crosses 180/20 =9 mso its speed is 9 ms^-1(ans)
it crosses itself in 8 sec
it crosses itself in 8 secso it's length is 8x9 m= 72 m(ans)
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