A father can do a task as fast as his two sons working together. If working alone, one son can complete the task in 6 hours and the other in 12 hours, how many hours does it take for father to complete the task?

A father can do a task as fast as his two sons working together. If wo

1.	A father can do a task as fast as his two sons working together. If working alone, one son can complete the task in 6 hours and the other in 12 hours, how many hours does it take for father to complete the task?
A.	6
B.	5
C.	4
D.	3
Answer» D. 3

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A father can do a task as fast as his two sons working together. If working alone, one son can complete the task in 6 hours and the other in 12 hours, how many hours does it take for father to complete the task?

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