SOLUTION: It takes pipe 1 ten hours to fill a pool. Pipe 2 can do it in 12 hours. If the pool is full, the drain pipe can empty it in 15 hours. If the pool were empty and all pipes were open

Algebra ->  Rate-of-work-word-problems -> SOLUTION: It takes pipe 1 ten hours to fill a pool. Pipe 2 can do it in 12 hours. If the pool is full, the drain pipe can empty it in 15 hours. If the pool were empty and all pipes were open      Log On


   



Question 440462: It takes pipe 1 ten hours to fill a pool. Pipe 2 can do it in 12 hours. If the pool is full, the drain pipe can empty it in 15 hours. If the pool were empty and all pipes were open, how long would it take to fill it?
I need to describe the variable, variable phrases, write the equation, and solve it. Thank you soo much!

Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
t/10+t/12-t/15=1
12t+10t-8t=120
14t=120
t=120/14=60/7 hours to fill the pool..