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8.A car moving on a straight road covers one third of the distance with 20 km/hr and the rest with 60 km/hr.The average speed is(A) 40 km/hr (B) 80 km/hr(C) 46km/hr(D)36 km/hr |
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Answer» Let the total distance be X so time for x/3 distance = X/3*20 = x/60and time for 2x/3 distance = 2x/3*60 = x/90 now, total time = x/60+x/90 = 3x/180 +2x/180 = 5x/180 so, avg. velocity = D/T = x/(5x/180) = 180/5 = 36km/h |
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