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 on the moving belt. The belt moves with a speed of 4 km h -1 . For an observer on a stationary platform, the speed of the child running in the direction of motion of the belt is
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Figure shows conditions of the questions .
In this case, speed of belt w.r.t ground 
Speed of child w.r.t. belt 
For an observer on a stationary platform, speed of child running in the directions of motion of the belt is 
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