A boy rides his bicycle 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 approximately.

10.2 km/hr

10.4 km/hr

10.6 km/hr

10.8 km/hr

Total distance traveled = (10+12) km = 22 km Total time taken = [10/12 + 12/10] hrs = 61/30 hrs Average speed = [22*30/61] km/hr = 10.8 km/hr.

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