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, P is turned off. In how many more minutes will q fill the cistern?
A.7
B.7(1/2)
C.8
D.8(1/4)
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0
the answer is
8.25.....
8.25.....
Answered by
2
----: ||ANSWER|| :----
(P+Q) efficiency=(5+4)(P+Q) efficiency=(5+4) = 9 units/minutes
(P+Q)(P+Q) fill in 3 minutes =9×3=279×3=27units
Remaining capacity= 60−27=3360−27=33units
Q fill remaining cistern in
T.CEfficiency of Q=334=814T.CEfficiency of Q=334=814 minutes
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