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? Choose the correct choice:
A) 12.9 B) 10.8 C) 26.2 D) 17.8 E) 12.9
Total distance traveled = 10 + 12= 
<gadget id="calculator">10 + 12</gadget>
<output>22</output>
22 km /hr.   Total time taken= 10/12 + 12/10 = 61/30 hrs.   Average speed = 22 * 30/61 = 10.8 km/hr.   Answer: 10.8
<result>B</result>
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?