Mathematics, 23.02.2021 14:00, serenad2

17. A cistern has two inlets A and B which can fill it in 12 minutes and 15 minutes respectively. An outlet C can empty the full cistern in 10 minutes. If all the three pipes are opened
together in the empty tank, how much time will they take to fill the tank completely?
Pls help

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17. A cistern has two inlets A and B which can fill it in 12 minutes and 15 minutes respectively. A...