A man hoes from a place A to B at a speed of 12km/hr and returns from B to A at a speed of 18 km/hr. The average speed for the whole journey of distance 12km is :
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A man hoes from a place A to B at a speed of 12km/hr and returns from B to A at a speed of 18 km/hr. The average speed for the whole journey of distance 12km is :