Question 69

A train crosses a platform in 50 seconds travelling with a speed of 72 km/hr. If the length of the train be 250 metres, then what will be the length (in metres) of the platform?

Solution

Speed of train = 72 km/hr = $$(72\times\frac{5}{18})$$ m/s = $$20$$ m/s

Let length of platform = $$x$$ m and length of train = 250 m

Using, time = distance/speed

=> $$\frac{250+x}{20}=50$$

=> $$250+x=50\times20$$

=> $$x=1000-250=750$$ m

=> Ans - (C)

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