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Two trains, each `50 m` long, are travelling in opposite directions with velocities `10 ms^-1 and 15 ms^-1`. The time of their crossing each other is.A. 2 sB. 4 sC. `2 sqrt(3)`D. `4 sqrt(3)`

Answer» Correct Answer - B
Total length to be crossed `= 50 + 50 = 100 m`
Relativity Velocity `= 10 + 15 = 25 m//s`
Time taken `= (100)/(25) = 4 s`.


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