a man covers a distance of 60 km from A to B at a speed of 20 km/hour and returns from B to A at a speed of 30 km/hour. his average speed for the whole journey is?
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average speed is 25km per hour
average speed = (20 + 30)/2
= 25km/h
average speed = (20 + 30)/2
= 25km/h
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