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$1\over2$
C. 8
D.8$1\over4$



[ A ]    a
[ B ]    b
[ C ]    c
[ D ]    d right
Answer : Option D
Explanation :

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