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Maths Mcqs

pipes P and Q would fill a cistern 18 and 24 minutes respectively. Both pipes being opened, find when the first pipe must be turned off so that the cistern may be just filled in 12 minutes?

A. after 12 mins
B. after 9 minsCorrect Answer
C. after 8 1/2 mins
D. after 10 mins
Correct Option: B. after 9 mins

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