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One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone will be able to fill the tank in?
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Pipes & Cisterns
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90minutes
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(1/x) + (3/x) = (1/36)
x=144
i.e. 144 min
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ans.=144min.
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Pipe B alone can fill the tank in 27 minutes.
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Answer to this is 9min