Question

Shankar covers a certain distance by a car driving at 40 km/h and he returns to the starting point riding on a scooter with a speed of 20 km/h. Find the average speed of the whole journey. 

A 22(2/3) km/h
B 29(2/3) km/h
C 24(2/3) km/h
D 26(2/3) km/h
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