Question

A man travelled a total distance of 400 km. He travelled first 300 km on car with a speed of 60 km/h and rest of the distance on bike whose speed is 40 km/h less than that of the car. Find his average speed for the whole journey.

A 42 km/h
B 43 km/h
C 40 km/h
D 45 km/h
E None of these
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