A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?
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Since the train crosses the man, distance covered is the length of the train =l(say)
Speed =54*5/18 m/s=15
time =20 sec
l=t*s
----->l=300 m
While crossing platform,the distance covered is length of train +that of platform=(l+p)
time =36 sec,s=15m/s....(l+p)=36*15....300+p=540.....p=240m(ans)
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