2 years ago in Time and Work

# 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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