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.
Total time taken to cover the whole journey = 100/20 + 200/10 = 5 + 20 = 25 km Desired average speed = 300/25 = 12 km/h
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