Two pipes can fill a cistern in 20 minutes and 30 minutes respectively – McqOptions

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1.	Two pipes can fill a cistern in 20 minutes and 30 minutes respectively. Both pipes being opened, time when the first pipe must be turned off so that the cistern may be filled in 10 minutes more will be
A.	8 minutes
B.	9 minutes
C.	10 minutes
D.	12 minutes
Answer» B. 9 minutes

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