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It takes 27 seconds and 17 seconds for two trains to cross a stationary man on the platform in reverse. If two trains take 23 seconds to cross each other, what is the speed ratio?

A. $1:3$

B. $3:2$

C. $3:4$

D. None

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সঠিক উত্তরঃ B. $3:2$

Explanation:

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It takes 27 seconds and 17 seconds for two trains to cross a stationary man on the platform in reverse. If two trains take 23 seconds to cross each other, what is the speed ratio?