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[" (1) Two trains "A" and "B,100m" and "...

[" (1) Two trains "A" and "B,100m" and "60m" long are "],[" moving in opposite directions on parallel "],[" tracks.The velocity of shorter train is "3" times "],[" that of the longer ones.If the trains take "4],[" seconds to cross each other the velocities of "],[" trains are "],[" 1) "V_(A)=10ms^(-1);V_(B)=30ms^(-1)],[" 2) "V_(A)=20ms^(-1);V_(B)=60ms^(-1)],[" 3) "V_(A)=5ms^(-1);V_(B)=15ms^(-1)],[" 4) "V_(A)=5ms^(-1);V_(B)=15ms^(-1)]

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