document.write( "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
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Algebra.Com's Answer #788407 by ikleyn(52778) $\"\"$ $\"About$

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document.write( "You may check it on your own, that the rate of draining is  7500 liters per hour.\r\n" );
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document.write( "Having this info, you can easily calculate the necessary time by dividing the total volume of 80000 L by 7500 L.\r\n" );
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document.write( "ANSWER.  The pool will be empty in 10  hours = 10 hours and 40 minutes after the starting moment.\r\n" );
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