SOLUTION: Please help me solve this. A tank can be filled by a pipe in 3.0 h and emptied by another pipe in 4.0 h. How much time will be required to fill an empty tank if both are running

Algebra ->  Finance -> SOLUTION: Please help me solve this. A tank can be filled by a pipe in 3.0 h and emptied by another pipe in 4.0 h. How much time will be required to fill an empty tank if both are running      Log On


   

Question 1098651: Please help me solve this.
A tank can be filled by a pipe in 3.0 h and emptied by another pipe in 4.0 h. How much time will be required to fill an empty tank if both are running?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Fill Rate, 1%2F3-1%2F4=4%2F12-3%2F12=1%2F12, which means ONE tank's worth filled in TWELVE hours.

Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
.
See the lesson
    - Using Fractions to solve word problems on joint work
in this site.

Your problem is exactly Problem 5 of this lesson.

You will find there many other similar solved problems with detailed explanations.