Two pipes P and Q can fill a cistern in 12 and 15 minutes respectively.
Question 1:
Two pipes P and Q can fill a cistern in 12 and 15 minutes respectively. Both are opened together, but at the end of 3 minutes the first is turned off. How much longer will the cistern take to fill?
A.9 1/4 min
B.11 1/4 min
Feedback3/12 + x/15 = 1 x= 11 1/4.
C.7 1/4 min
D.8 1/2 min
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