I feel really blond at the moment... Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 ½ hours. How quickly can all three fill the pool together? Can anyone guide me to the solution of solving the problem. I know the answer but I just cannot seem to be able to get to it... I have had a few other questions like this and I would like to know how to do them.