SOLUTION: Mark needed to empty his backyard pool. When he started, the pool contained 80 000 L of water. After sixty minutes it contained 72 500 L of water; after ninety minutes it contained

Question 1164125: Mark needed to empty his backyard pool. When he started, the pool contained 80 000 L of water. After sixty minutes it contained 72 500 L of water; after ninety minutes it contained 68 750 L of water; and after three hours it contained 57 500 L of water. When will his pool be
empty?
Answer by ikleyn(52777) (Show Source): You can put this solution on YOUR website!
.


You may check it on your own, that the rate of draining is  7500 liters per hour.


Having this info, you can easily calculate the necessary time by dividing the total volume of 80000 L by 7500 L.


ANSWER.  The pool will be empty in 10  hours = 10 hours and 40 minutes after the starting moment.

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