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Two pipes A and B can fill a cistern in 37 1/2 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the pipe B is turned off after? |
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Answer» Answer: Part filled by PIPE A in 1 minute = 2 75 Part filled by pipe B in 1 minute = 1 45 Suppose pipe B is closed after x MINUTES. Then, 2 75 × 30 + 1 45 × x = 1 4 5 + x 45 = 1 x = 9 |
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