A 300 metre long train crosses a platform in 39 seconds while it crosses a signal pole in 18 seconds. What is the length of the platform?

320 m
350 m
650 m
Data inadequate

Correct Answer: 350 m

Explanation:

Speed =	❨	300	❩	m/sec =	50	m/sec.
		18			3

Let the length of the platform be x metres.

Then,	❨	x + 300	❩	=	50
		39			3

⟹ 3(x + 300) = 1950

⟹ x = 350 m.

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