A and B are two cities. A man travels from A to B at a speed of 10 km/hr. and returns back at the speed of 30 km/hr. Find his average speed for whole journey.
A12 km/hr
B15 km/hr
C20 km/hr
D22.5 km/hr
A12 km/hr
B15 km/hr
C20 km/hr
D22.5 km/hr
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