Fill pipe P is 21 times faster than fill pipe Q. If Q can fill a cistern in 110 minutes, find the time it takes to fill the cistern when both fill pipes are opened together

Options
a) 6 minutes
b) 4 minutes
c) 5 minutes
d) 3 minutes

Solution

As per question
P work 21
Q work 1
Q can fill a cistern in 110 minutes
Total work = 22
both fill pipes are opened together = 110/22 = 5 min.

Ans: 5 Min