Question

Three cisterns in a public lavatory are designed to flush at intervals of 8, 13 and 15 seconds. After how many minutes will they flush together?

Answer 1

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Urinals often flush regardless of use, wasting a lot of water, especially out of hours. Typical uncontrolled flush of urinals is three times an hour, which with a 7.5 - 12 litre cistern will be using 197 - 315 m3 water/year.

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