Two pipes A and B would fill a cistern in 20 and 34minutes respectively.Both pipes being opened,find when the first pipe must be turned off so that the cistern may be just filled in 17minutes?

Two pipes A and B would fill a cistern in 20 and 34minutes respecti

1.	Two pipes A and B would fill a cistern in 20 and 34minutes respectively.Both pipes being opened,find when the first pipe must be turned off so that the cistern may be just filled in 17minutes?
A.	10min
B.	30min
C.	17min
D.	34min
Answer» B. 30min

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Two pipes A and B would fill a cistern in 20 and 34minutes respectively.Both pipes being opened,find when the first pipe must be turned off so that the cistern may be just filled in 17minutes?

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