The Draining Bathtub Puzzle

Puzzle of the Day 2088 : The Draining Bathtub Riddle

A bathtub has two taps and a plug hole.
The cold tap fills the tub in 12 minutes, the hot one in 8 minutes.
The plug hole drains the tub in 24 minutes with the taps off.
Someone left both taps and the hole open.

How long will it take to fill?

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