The average speed of Gaurav during a two-way journey is 15 km/h. If he walked a distance of 20 km every hour while going, then his speed while returning will be:
A15 km/h
B10 km/h
C12 km/h
D11 km/h
A15 km/h
B10 km/h
C12 km/h
D11 km/h
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