Passage

Directions: Read the data carefully and answer the following question. David, John, Mike, and Sam are four workers who together can complete a project 'P' in 9 days and Sam did the one fifth of the project P. The efficiency of David is five times that of Mike, while John's efficiency is 100% more than that of Mike. Also, Mike and David working together can complete the project 'P' in p days, while Mike and Sam working together can complete the project 'P' in y days.

m men can do a project in n days and n women can do the same project in 3m days. p men and 1.5y women together can complete the same work in 20 days. 5 men and (y + 5) women started working together and they did work only for D days and remaining work is completed by a women in 10D days. Find the value of D.