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On a long horizontally moving belt , a ...

On a long horizontally moving belt , a child runs to and fro with a speed `9 km h^(-1)` with respect to the belt) between his father and mother located 50 m apart. The belt moves with speed of `4 km h^(-1)`. For an observer on a stationary platform , the speed of the child runing in the direction of motion of the belt is

A

`4 km h^(-1)`

B

`5 km h^(-1)`

C

`9 km h^(-1)`

D

`13 km h^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
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