SOLUTION: an inlet pipe on a swimming pool can be used to fill the pool in 10 hours. The drain pipe can be used to empty the pool in 15 hours. If the pool is 1/3 full and then the inlet pipe
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Question 806035: an inlet pipe on a swimming pool can be used to fill the pool in 10 hours. The drain pipe can be used to empty the pool in 15 hours. If the pool is 1/3 full and then the inlet pipe and drain pipe are both opened, how long from that time will it take to fill the pool?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
an inlet pipe on a swimming pool can be used to fill the pool in 10 hours. The drain pipe can be used to empty the pool in 15 hours. If the pool is 1/3 full and then the inlet pipe and drain pipe are both opened, how long from that time will it take to fill the pool?
Inlet pipe does 1/10 of the job in 1 hour
drain does 1/15 of the job in 1 hour
when both are open they doe 1/10 -1/15 of the job in 1 hour
=1/30 of the job in 1 hour
1/3 is full so 2/3 is empty
(2/3)/(1/30)
2/3 * 30
=20 hours
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