A motorcylist drives from place A to B with a uniform speed of 30 km h-1 and returns from place B to A with a uniform speed of 20 km h-1 . Find his average speed
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Explanation:
Let the length of the line segment AB be x m
The time taken is given as,
T = distance covered/speed
Total time = t1 +t2 = x/30 + x/20 = 5x/60 h
Average speed = Total distance/Total time = 2x/5x/60 = 24 km/hr
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