Ok here is Q#1

A tank can be filled by one of two pipes in 12.00 h and by the other of the two in 1.00 h. The same tank can be emptied by a drain pipe in 10.5h. If all three pipes are open, how long will it take to fill the tank.

Answer in time?

Q#2

Bill can do a jobin 3.8 j, and john can do the same job in 5.4h. How will it take them to do the job together? ROUND your answer to the nearest quarter of an hour??

Answer in time?

PLEASE explain how you got to your answer along with the equation to get to it.

THANKS FOR YOUR HELP.

I have no clue on solving this, I am thinking you add up the 2 times together and divide by 2?

But the water one above I have no clue at all.

Jo