P and Q together complete a job in \(4{2 \over5}\) days. R and S complete the same job in \(4{8 \over9}\) days. If P, Q, R and S work together, how many days do they need to complete the same job?
1
\(2{7 \over18}\)
2
\(1{7\over18}\)
3
\(1{6 \over19}\)
4
\(2{6 \over19}\)