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two trains each of length 240m are moving in opposite directions in such a manner that the velocity of one is twice that of other. They take 4 seconds to cross eachother.Then the velocity of fastest train is -------. kindly replay with explanation.

velocity, v=v₁ -v₂

Velocity =distance/time

distance =240+240=480m

time=4s

Velocity=480/4=120m/s

given that,v₁=2v₂

There fore,v₂ =120m/s ,v₁ =240 m/s.

The velocity of faster train is 240m/s