Question: on a train going railway platform in one direction takes 4 seconds to pass him. Another train of same length going in opposite direction

on a train going railway platform in one direction takes 4 seconds

on a train going railway platform in one direction takes 4 seconds to pass him. Another train of same length going in opposite direction takes 5 seconds to pass him. The time taken by the 2 train to cross eachother will be ? A coolie standing observes that a

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