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Two trains of lengths a metres and b metres move in the same direction at u m/sec and v m/sec (u greater than v). What is the correct formula for the time the faster train takes to cross the slower one?

1. Two trains of lengths a metres and b metres move in the same direction at u m/sec and v m/sec (u greater than v). What is the correct formula for the time the faster train takes to cross the slower one?

 

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