E and F together can do a work in 10 days If E alone can do it in 30 days F alone can do it in days ........

Quantitative Aptitude (RRB NTPC) Time and work

E and F together can do a work in 10 days. If E alone can do it in 30 days, F alone can do it in ________ days.

Let the total work be LCM of 10 and 30 = 30 units

Efficiency of E+F = 30/10 = 3 units /day

Efficiency of E = 30/30 = 1 unit/day

Efficiency of F = 3-1 = 2 units / day

Time taken by F to complete the work = 30/2 = 15 days

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