Train A and train B are running on paral...

Train A and train B are running on parallel trackes in the opposite directions with speeds of 36 km/ hour and 72 km / hour respectively . A person is walking in train A in the direction opposite to its motion with a speed of 1.8 km / hour. Speed `("in" ms^(-1))` of this person as observed from train B will be close to : (take the distance between the tracks as negligible )

`29.5 ms^(-1)`

`30.5ms^(-1)`

`31.5 ms^(-1)`

`28.5 ms^(-1)`

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