Question

A man travelled a total distance of 350 km. He travelled first 250 km on car with a speed of 20 km/h and rest of the distance on bike whose speed is 12 km/h less than that of the car. Find his average speed for the whole journey.

A 11 km/h
B 12 km/h
C 14 km/h
D 10 km/h
E None of these
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