An inlet pipe can fill an empty pool in 3 hours. Another pipe can fill the same pool in 4 hours. How long will it take to fill the pool if both pipes are on?

Question

how would this equation be set up?

Answer 1

time=1pool/(1pool/3 + 1pool/4)

Notice the rates add..1pool/4hrs + 1pool/3hrs.

time=12/7 hrs

Answer 2

8 hrs

Answer 3

A large pipe can fill a tank 10 minutes faster than it takes a smaller pipe to fill the same tank. Working together, both pipes can fill the tank in 12 minutes. How long would it take the large pipe working alone to fill the tank