A moving platform moves with a speed of 80 km/hr. What will be the speed of a boy who is running on it with a speed of 20 km/hr opposite to the motion of the moving track measured by a speed sensor placed on stationary ground?

A moving platform moves with a speed of 80 km/hr. What will be the speed of a boy who is running on it with a speed of 20 km/hr opposite to the motion of the moving track measured by a speed sensor placed on stationary ground? Correct Answer 60 km/hr

Speed of the boy measured by a speed sensor who is running on the moving platform will be 60 km/hr. Since the boy and the moving platform moves in opposite direction then the speed of the boy gets subtracted with the speed of the moving platform therefore net speed becomes 80-20=60.
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