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Question

A man travelled a total distance of 150 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 12 km/h

B 16 km/h

C 12 km/h

D 15 km/h

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