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Mathematics 19 Online
OpenStudy (anonymous):

A tank can be filled by three pipes separately in 20,30 and 60 minutes respectively. In how many minutes can it be filled by the three pipes acting together?

OpenStudy (anonymous):

In 1 min pipe A fills 1/20 of the tank, pipe B 1/30 of the tank and pipe C 1/60 of the tank. Thus we have the following solution:

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