Question:A father can do a job as fast as his two sons working together. If one son does the job in 3 hours and the other in 6 hours, how many hours does it take the father to do the job ? 

A `1` 
B `2` 
C `3` 
D `4` 

+ Answer
B 

+ Explanation
solution:
Father's 1 hour's work `= (1/3 + 1/6 )`
                        `= 1/2`.
`:.` Time taken by father to complete the work `= 2`hours.

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Md. Habib Ullah

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