document.write( "Question 37021: Jim can fill a pool carrying bucks of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 ½ hours. How quickly can all three fill the pool together? \n" ); document.write( "
Algebra.Com's Answer #26364 by fractalier(6550)\"\" \"About 
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Here's the setup...
\n" ); document.write( "t/30 + t/45 + t/90 = 1
\n" ); document.write( "now multiply everything by 90 to clear fractions and then solve for t...
\n" ); document.write( "90[t/30 + t/45 + t/90 = 1]
\n" ); document.write( "3t + 2t + t = 90
\n" ); document.write( "6t = 90
\n" ); document.write( "t = 15 minutes
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