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6.A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h. Finding themarket closed, he instantly turns and walks back home with a speed of 7.5 km/h. The average speed of theman over the interval of time 0 to 40 min. is equal to(A) 5 km/h(B) 25 km/h30445(Dy 1km/h8(C) km/h |
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