Question
A man travelled a total distance of 250 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.Solution
Total time taken to cover the whole journey = 100/20 + 150/10 = 5 + 15 = 20 km Desired average speed = 250/20 = 12.5 km/h
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