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A car travels at a speed of 80 km/h during the first half of its running time and at 40 km/ h during the other half. Find the average speed of the car. (60



For first half, distance=v1t/2.........for second half, distance=v2t/2
Average speed=v1t/2+v2t/2 the whole divided by t/2+t/2

                       80+40/2 = 60 km/h 
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