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Two trains going on a parallel line in o...

Two trains going on a parallel line in opposite directions takes 10 seconds to cross each other. But if they are going in the same directions the longer train crosses the shorter train in 30 seconds. If the length of longer train is decreased by 50%, the time taken to cross the shorter train while going in the same direction decreases by 8 seconds. The time taken by the longer train to cross a tunnel twice its length, if the difference between the length of the trains is 25 m is: a. 30 Sec b. 24 sec c. 36 sec d. 40 sec

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