Question 66

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?

Solution

Relative speed = 72 + 108 = 180 kmph = $$180\times\frac{5}{18}=50\ $$ m/sec

Distance = $$Dis\tan ce\ =\ Speed\ \times\ Time\ =\ 50\times\ 10=500$$ m

Length of each train = $$\frac{500}{2}=250$$ m

Time taken to cover plarform= $$\frac{250+350}{20}$$ = 30 s

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