Study the following information carefully and answers the questions given below.
Shubham can do a piece of work in 20 days. With the help of Ashutosh, he can complete the work in \(\frac{60}{7}\) days. Sushant can do the same work in 5 days less than that of Ashutosh, when working alone. Shubham started the work alone, Ashutosh and Sushant joined him alternate days starting with Ashutosh and then Sushant, thus the time taken by them to complete the work is ___ (P) ___days. The efficiency of Prashant is \(\frac{1}{3}\)rd of the efficiency of Ashutosh. Shubham and Sushant started the work. Prashant joined them after 3 days. Time taken by them to complete the remaining part of the work is ___  (Q) ___days.
The time taken to complete a piece of work for Rohit is same as that of Sushant. Shubham and Rohit together complete the work in ___ (R) ___days. The efficiency of Karishma is half of the efficiency of Ashutosh. Karishma and Rohit started the work and left after 3 days. Sushant can complete the remaining part of the work in ___ (S) ___days.
If Shubham, Ashutosh, Rohit and Karishma started the work together, they can complete the work in ___ (T) ___days