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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:

A. 10.4 km/hr
B. 10.8 km/hr
C. 12 km/hr
D. 14 km/hr
E. 13 km/hr

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