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The time taken by train B to cross a platform of 120 metres is 3 sec less than the time taken by train A to cross the same platform. The sum of length of train A and B is 600 metres. The ratio of speeds of trains A and B is 3:2 respectively. Find the speed of train
B.

A 25 m/s

B 45 m/s

C 36 m/s

D Can't be determined

E None of these

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