document.write( "Question 250056: Working together, two pumps can drain a certain pool in 5 hours. If it takes the older pump 15 hours to drain the pool by itself, how long will it take the newer pump to drain the pool on its own? \n" ); document.write( "
Algebra.Com's Answer #182423 by ankor@dixie-net.com(22740)\"\" \"About 
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Working together, two pumps can drain a certain pool in 5 hours.
\n" ); document.write( " If it takes the older pump 15 hours to drain the pool by itself,
\n" ); document.write( " how long will it take the newer pump to drain the pool on its own?
\n" ); document.write( ":
\n" ); document.write( "you can do this in your head but here is an algebra equation way
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\n" ); document.write( "Let t = time required by new pump to drain the pool
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\n" ); document.write( "Let the completed job (drained pool) = 1
\n" ); document.write( ":
\n" ); document.write( "\"5%2F15\" + \"5%2Ft\" = 1
\n" ); document.write( "Multiply by 15t
\n" ); document.write( "t(5) + 15(5) = 15
\n" ); document.write( "5t + 75 = 15t
\n" ); document.write( "75 = 15t - 5t
\n" ); document.write( "75 = 10t
\n" ); document.write( "t = 75/10
\n" ); document.write( "t = 7.5 hrs new pump alone
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\n" ); document.write( ":
\n" ); document.write( "Check this
\n" ); document.write( "5/15 + 5/7.5 =
\n" ); document.write( ".33 + .67 = 1
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