document.write( "Question 345044: if 2 pipes can fill a pool in 18 hours when both pipes are open and one of the pipes can fill the pool in 30 hours, how long would it take the other pipe to fill the pool alone \n" ); document.write( "

Algebra.Com's Answer #246851 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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if 2 pipes can fill a pool in 18 hours when both pipes are open and
\n" ); document.write( " one of the pipes can fill the pool in 30 hours,
\n" ); document.write( " how long would it take the other pipe to fill the pool alone
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\n" ); document.write( "Let t = time required by the other pipe alone
\n" ); document.write( "Let the completed job = 1 (a full pool)
\n" ); document.write( ":
\n" ); document.write( " $\"18%2F30\"$ + $\"18%2Ft\"$ = 1
\n" ); document.write( "Multiply by 30t, results:
\n" ); document.write( "18t + 30(18) = 30t
\n" ); document.write( "540 = 30t - 18t
\n" ); document.write( "540 = 12t
\n" ); document.write( "t = $\"540%2F12\"$
\n" ); document.write( "t = 45 hr for the other pipe to fill the pool alone
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check this
\n" ); document.write( " $\"18%2F30\"$ + $\"18%2F45\"$ = 1
\n" ); document.write( " $\"3%2F5\"$ + $\"2%2F5\"$ = 1
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