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Olympiad-Math
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Class 6
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Math
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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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