A train takes 20 seconds to cross a pole. It takes 50 seconds to cross the platform. What is the ratio of the length of the platform to that of the train?

A 2 : 3

B 2 : 5

C 5 : 2

D 3 : 2

E None

Solution

Correct Answer: Option D

মনে করি, ট্রেনের দৈর্ঘ্য = x মি.
এবং প্লাটফর্মের দৈর্ঘ্য  = y মি.

শর্তমতে, x/২০ = (x+y)/৫০

⇒ x/২ = (x+y)/৫

⇒ ৫x = ২x + ২y

⇒ ৩x = ২y

⇒ y/x = ৩/২

⇒ y:x = ৩:২

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