You have accidentally left out the plug and are attempting to fill the bath with both 2 taps full on. The hot tap takes 6 minutes to fill the bath, the cold tap takes 4 minutes, and the water empties through the plug hole in 12 minutes. In how many minutes will the bath be filled?
REVEAL THE ANSWER
3 minutes. This is solved by 1/6 + 1/4 – 1/12 = 0.166 + 0.25 – 0.083 = 0.333 1/0.333 = 3 minutes