Question

A tap can fill a tank in 6 hours and another can empty it in 8 hours. In how many hours the tank will be full if both are open?

Answer 1

I thought we did this once?

Answer 2

A sixth less an eighth per hour

Answer 3

1/6 - 1/8 = 1/24

24 hours.

Answer 4

oh yeh that's it thenx