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On a long horizontal bolt, a child runs ...

On a long horizontal bolt, a child runs to and fro with a speed of 9 km/h (with respect to the belt) between h father and mother located 50cm agant on the moving belt. The belt moves with a speed of 4 km/h. For an observ on the platform the speed of the child in the direction of motion of the belt is

A

9km/h

B

4km/h

C

13km/h

D

5km/h

Text Solution

Verified by Experts

The correct Answer is:
C
Speed of the child w.rt moving belt is 9km/hr. As the belt is moving with a speed of 4km/h, hence wit observer on the platform, speed of child in the direction of motion of the belt-9+4=13 km/h
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