A man travelled a total distance of 300 km. He travelled first 200 km on car with a speed of 40 km/h and rest of the distance on bike whose speed is 20 km/h less than that of the car. Find his average speed for the whole journey.
Total time taken to cover the whole journey = 200/40 + 100/20 = 5 + 5 = 10 km Desired average speed = 300/10 = 30 km/h
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