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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 45 min. and 36 min. respectively. A water pipe can empty the tank in 30 min. First P and Q are opened. After 7 minutes, R is also opened. In how much time, the tank in full ?


( A ) 36
( B ) 46
( C ) 42
( D ) 56

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