A car covers the first half of the distance between two places at a speed of 40 kmh and the second half at 60 kmh. What is the average speed of the car ?
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let distance =2d
also average speed =total distance/total time
and time =distance/speed
thus
total time=d/40 +d/60 =d/24
speed=2d.24/d=48kmh
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