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Two Pipes A And B Can Fill A Cistern In 20 And 30 Minutes Respectively, And A Third Pipe C Can Empty It In 40 Minutes. How Long Will It Take To Fill The Cistern If All The Three Are Opened At The Same Time? |
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Answer» 1/20 + 1/30 - 1/40 = 7/120 120/7 = 17 1/7 1/20 + 1/30 - 1/40 = 7/120 120/7 = 17 1/7 |
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