document.write( "Question 279698: Don't know what kind of question this is....\r
\n" ); document.write( "\n" ); document.write( "Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 90 minutes. How quickly can all three fill the pool together? (Answer is 15 minutes - I have no clue how to even start!) \n" ); document.write( "
Algebra.Com's Answer #203295 by nerdybill(7384)\"\" \"About 
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Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 90 minutes. How quickly can all three fill the pool together? (Answer is 15 minutes - I have no clue how to even start!
\n" ); document.write( ".
\n" ); document.write( "Rates at which each can fill the pool:
\n" ); document.write( "Jim: 1 pool per 30 mins
\n" ); document.write( "Sue: 1 pool per 45 mins
\n" ); document.write( "Tony: 1 pool per 90 mins
\n" ); document.write( ".
\n" ); document.write( "Let x = minutes all three can fill the pool
\n" ); document.write( "then
\n" ); document.write( "x(1/30 + 1/45 + 1/90) = 1
\n" ); document.write( "The 1 on the right represents 1 pool
\n" ); document.write( ".
\n" ); document.write( "Multiply both sides by 90:
\n" ); document.write( "x(3 + 2 + 1) = 90
\n" ); document.write( "6x = 90
\n" ); document.write( "x= 90/6
\n" ); document.write( "x = 15 minutes \n" ); document.write( "
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