document.write( "Question 953738: 3 pumps were used to empty a pond hold an unknown amount of water. If pump 1 can empty it in 4 days, pump 2 in 10 days and #3 in 5 days, how many days will it take to empty the pond if all 3 are running at the same time? \n" ); document.write( "
Algebra.Com's Answer #582488 by nerdybill(7384)\"\" \"About 
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3 pumps were used to empty a pond hold an unknown amount of water. If pump 1 can empty it in 4 days, pump 2 in 10 days and #3 in 5 days, how many days will it take to empty the pond if all 3 are running at the same time?
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\n" ); document.write( "Let x = time (days) for all 3
\n" ); document.write( "then
\n" ); document.write( "x(1/4 + 1/10 + 1/5) = 1
\n" ); document.write( "multiplying both sides by 20:
\n" ); document.write( "x(5 + 2 + 4) = 20
\n" ); document.write( "x(11) = 20
\n" ); document.write( "x = 20/11
\n" ); document.write( "x = 1.82 days
\n" ); document.write( "or
\n" ); document.write( "x = 1 day, 19 hours and 38 minutes
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