P takes twice as much time as Q or thrice as much time as R to finish a piece of work. Working together, they can finish the work in 5 days. Q can do the work alone in
Explanation:
Let the time taken by P alone be 6x days. ∴ Time taken by Q alone will be 3x days and that by R will be 2x days.
Working together the three of them can finish the work in 5 days.
⇒ 15=1P+1Q+1R
⇒ 15=16x+13x+12x
⇒ 15=1+2+36x
⇒ 15=1x
⇒ x = 5
∴ Q alone can complete the work in 3x = 15 days.
Hence, option (c).
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