SOLUTION: An inlet pipe on a swimming pool can be used to fill the pool in 12 hours. The drain pipe can be used to empty the pool in 36 hours. If the pool is 13 filled and then the inlet pip

Algebra ->  Rate-of-work-word-problems -> SOLUTION: An inlet pipe on a swimming pool can be used to fill the pool in 12 hours. The drain pipe can be used to empty the pool in 36 hours. If the pool is 13 filled and then the inlet pip      Log On


   

Question 962204: An inlet pipe on a swimming pool can be used to fill the pool in 12 hours. The drain pipe can be used to empty the pool in 36 hours. If the pool is 13 filled and then the inlet pipe and drain pipe are opened, how long from that time will it take to fill the pool?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Not solvable because the last sentence is incomplete:
"If the pool is 13 filled and then the inlet pipe and drain pipe are opened, "
You need to straighten that information.

Regardless, the fill rate for both pipes open at the same time will be (1/12-1/36) pools per hour. That is 3%2F36-1%2F36=2%2F36=1%2F18. That means, 1 pool's worth in 18 hours, filling rate.

What is, "pool is 13 filled"? What is the capacity of this pool? What did the "13" mean?