A car travels from Kanpur to Delhi at an average speed of 60 km/h and returns at an average speed of 90km/h. Find the average speed of the car in the whole journey.
A65 km/h
B78 km/h
C60 km/h
D72 km/h
A65 km/h
B78 km/h
C60 km/h
D72 km/h
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