A boy rides his bicycle 10km at an average speed of 12 km per hr and again travels 12 km at an average speed of 10 km per hr his average speed for the entire trip is approximately:
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we know that average speed is the ratio of total distance travelled to that of total time taken, so total distance the boy travelled is 10 + 12 = 22
time taken for the first 10 kms is 10/12hr
time taken for the next 12 kms is 12/10hr
total time taken = 10/12 + 12/10 = 61/30hr
average speed = 22*30/61 = 10.8196 km/hr
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