Question

A man travelled a total distance of 300 km. He travelled first 100 km on car with a speed of 20 km/h and rest of the distance on bike whose speed is 10 km/h less than that of the car. Find his average speed for the whole journey.

A 10 km/h
B 11 km/h
C 12 km/h
D 15 km/h
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