A boy starts from a point A, travels to a point B at a distance of 3 km from A and returns to A. If he takes two hours to do so, his speed is(a) 3 km/h(b) zero(c) 2 km/h(d) 1.5 km/h
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d is correct as speed is equal to distance upon time 3 2 - 1.5 km per hour
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