Bathtub filling Riddle

A bath tub has two taps for cold and hot water to fill and a plugged hole to drain the water.

The cold tap on its own fills the tub in 12 minutes, the hot one in 5 minutes.

The plug hole can drain the tub in 30 minutes with the taps off.

How long will the bath tub take to fill if I leave both taps on with the plug left out?

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SherlockHolmes Expert Asked on 9th March 2018 in No Category.
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    one2345678 Starter Answered on 9th March 2018.
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