an athlete runs from A to B with a speed of 30 km per hour and returns back from B to a with a speed of 20 km per hour find his average speed.
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Explanation:
speed from A to B = 30 km/h
speed from B to A = 20 km/h
average speed = (30+20)/2
average speed = 50/2
average speed = 25 km/h
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