P and Q Working separately can do a piece of work in 6 days and 11 days if they work alternately beg......

P and Q Working separately can do a piece of work in 6 days and 11 days, if they work alternately beginning with P then the work will be completed in how many days ?

Answer
8 days
Explanation :
Total work = 6*11 = 66
2 days(P+Q) = 1/6 + 1/11 = (11+6)/66 = 17/66
6 days(P+Q) = 51/66
Remaining work = (1-(51/66)) = 15/66
In 15, 6 done by P remaining done by Q (2 days)
6+2 = 8 days

By: Manpreet kaur