When the waste pipe is closed, two taps can separately fill a cistern in 10 and I2 minutes respectively.When the waste pipe is open they together fill it in I5 minutes. How long does it take waste pip

When the waste pipe is closed, two taps can separately fill a ciste

1.	When the waste pipe is closed, two taps can separately fill a cistern in 10 and I2 minutes respectively.When the waste pipe is open they together fill it in I5 minutes. How long does it take waste pip
A.	8min 34sec
B.	7min 10sec
C.	12min
D.	10min
Answer» B. 7min 10sec

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When the waste pipe is closed, two taps can separately fill a cistern in 10 and I2 minutes respectively.When the waste pipe is open they together fill it in I5 minutes. How long does it take waste pip

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