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Two railway tracks are paraller to west-...

Two railway tracks are paraller to west-east direction . Along one track train A moves with a speed of `30 m*s^(-1)` from west to east, while along the second track, train B moves with a speed of `48 m*s^(-1)` from east to west . The relative speed of B with respect to A is

A

`48 m*s^(-1)`

B

`-78 m*s^(-1)`

C

`30 m*s^(-1)`

D

zero

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The correct Answer is:
B
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