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A boy ride his bicycle of 10 km at an average speed of 12 km/hr and again travels 12 km at an average speed of  10 km/hr his average speed for the entire trip is approx.
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Average speed = total distance covered/total time taken
total distance covered = 10+12 = 22 km

total time taken = 10/12+12/10 = .83+1.2 = 2.03

therefore average speed = 22/2.03=10.83km/hr
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