X can complete \(1 \over 4\)of a work in 3 days and Y can complete \(1 \over 6\)of the same work in 4 days. X and Y worked together for 6 days and Z alone completed the remaining work in 8 days. If Y and Z work together, how much time will they take to complete the same work?
1
9\(1 \over 7\)days
2
10 days
3
13\(5 \over 7\) days
4
12 days