Sewage Treatment. A sludge pool is filled by two inlet pipes. One pipe can fill the pool
Chapter 7, Problem 7.7.36(choose chapter or problem)
Sewage Treatment. A sludge pool is filled by two inlet pipes. One pipe can fill the pool in 15 days, and the other can fill it in 21 days. However, if no sewage is added, continuous waste removal will empty the pool in 36 days. How long will it take the two inlet pipes to fill an empty sludge pool?
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