A boy rides his bicycle 10km at an average speed of 12km/hr and again travels 12km at an average speed of 10km/hr. His average speed for the entire trip is approximately? Choose the correct choice from the following choices:
A) 8km/hr B) 10.8km/hr C) 12.6km/hr D) 15.6km/hr E) 14km/hr
Total distance traveled = 10+12= 
<gadget id="calculator">10+12</gadget>
<output>22</output>
22km   Total time taken= 10/12 + 12/10 = 61/30 hrs   Average speed = 22*30/61 = 10.8km/hr   Answer is 10.8km/hr
<result>B</result>
A boy rides his bicycle 10km at an average speed of 12km/hr and again travels 12km at an average speed of 10km/hr. His average speed for the entire trip is approximately?