P alone can complete 7/10th of the work in 14 days, Q alone can complete 4/5th of the work in 12 days and R alone can complete 4/5th of the work in 8 days. Find the time taken by them when P, Q and R worked alternatively started by P?
1
\(14\frac{1}{4}\;\)days
2
\(15\frac{3}{4}\;\)days
3
\(14\frac{1}{6}\;\)days
4
\(14\frac{5}{6}\;\)days