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Questions  >>  Olympiad-Math  >>  Class 6  >>  Math  >>  Percentages
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Q)

Two pipes P and Q can fill a tank in 12 min. and 16 min. respectively. If both the pipes are opened simultaneously, after how much time Q should be closed so that the tank is full in 6 minutes ?


( A ) 6
( B ) 5
( C ) 4
( D ) 8

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