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) 10.7 km/hr	B) 10.8 km/hr	C) 17.8 km/hr	D) 10.5 km/hr	E) 30.8 km/hr
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 km/hr
<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?