I renovated my bathroom and got myself a new bath tub along with new accessories. I have two taps now - hot one and cold one. The hot tap fills the bath tub faster i.e. in fifteen minutes while it takes eighteen minutes for the cold tap to fill the bath tub.

The drain hole can drain the entirely filled bathtub in ten minutes when the taps are not running.

If I leave both the taps on with the drain plug left out, how long will it take the bath to fill?

• 45 minutes
  
  When both taps and drain hole are open, part filled in 1 minute = 1/15 + 1/18 - 1/10 = 1/45
  So required time = 45 minutes
• 6 years agoHelpfull: Yes(1) No(0)