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A man standing on a platform finds that ...

A man standing on a platform finds that a train takes 3 seconds to pass him and another train of the same length moving in the opposite direction, takes 4 seconds. The time taken by the trains to pass each other will be

A

`2frac(3)(7) s`

B

`3frac(3)(7)s`

C

`4frac(3)(7)s`

D

`5frac(3)(7)s`

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