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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?

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A. 320 m

B. 350 m

C. 650 m

D. Data inadequate

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Correct Answer : B.


Speed =30018 m/sec = 503 m/sec.   Let the length of the platform be x metres.  Then, x + 30039 = 503⇒3(x + 300) = 1950⇒x = 350 m.

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