Two trains of equal length travelling in opposite directions at 72 km/h and 108 km/h crosseach otherin 10 seconds. In how much time(in seconds) doesthefirst train cross a platform of length 350 m?
Relative speed = 72 + 108 = 180 kmph =Â $$180\times\frac{5}{18}=50\ $$ m/sec
Distance =Â $$Dis\tan ce\ =\ Speed\ \times\ Time\ =\ 50\times\ 10=500$$ m
Length of each train =Â $$\frac{500}{2}=250$$ m
Time taken to cover plarform= $$\frac{250+350}{20}$$ = 30 s
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