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Train "A" is moving along two parallel r...

Train "A" is moving along two parallel rail tracks towards north with speed "72km/h" and train "B" is moving towards south with ppeed "108km/h" .Velocity of train B with respect to "A" and velocity of ground with respect to "B" are `(ms^(-1)`

A

`-50` and 30

B

`-30` and 50

C

`-50` and `-30`

D

`50` and `-30`

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