A father can do job as fast as 2 sons working together If one son does the job in 3 hours and the ot...........

Quantitative Aptitude (CGL) Time and work

A father can do job as fast as 2 sons working together. If one son does the job in 3 hours and the other in 6 hours, the number of hours taken by the father, to do the job alone is

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Explanation:

The efficiency of first son=1*100/3=33.33%.
The efficiency of second son= 100/6= 16.67%.
Hence, the efficiency of father= 33.33 + 16.67= 50%.
And, the number of hours taken by father to complete the same job= 100/50=2 hours.