A work can be completed by P and Q working separately in 12 and 18 days, respectively. But they work on alternate days beginning with P. How many days will it take to complete the work?
SSC MTS 2021-04.09.2023-1
\(14\tfrac{1}{12}\)
15
\(14\tfrac{1}{3}\)
\(14\tfrac{1}{4}\)