Practical Mathematics for Grade 10, Problem ID: 4882

Practical Mathematics K10My bath has two taps and a plug hole.
The cold tap on its own fills the bath in 18 minutes, the hot one in 24 minutes.
The plug hole can drain the bath in 15 minutes with the taps off.
How long will the bath take to fill if I leave both taps on with the plug left out?

44 minutes30 minutes40 minutes33 minutes