document.write( "Question 1041146: Ralph can lay down a floor tile in 5 seconds. Bob can lay down a floor tile in 4 seconds. If both boys work together, how many seconds would it take them to install 450 floor tiles? \n" ); document.write( "

Algebra.Com's Answer #656093 by ikleyn(52852) $\"\"$ $\"About$

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\n" ); document.write( "Ralph can lay down a floor tile in 5 seconds. Bob can lay down a floor tile in 4 seconds.
\n" ); document.write( "If both boys work together, how many seconds would it take them to install 450 floor tiles?
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document.write( "Every 20 seconds Ralph lays 4 tiles and Bob lays 5 tiles.\r\n" );
document.write( "So, every 20 seconds both boys lay 4 + 5 = 9 tiles working together.\r\n" );
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document.write( " = 50.\r\n" );
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document.write( "Hence, the boys need 50*20 = 1000 seconds to lay all 450 tiles working together.\r\n" );
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document.write( "Answer.  1000 seconds.\r\n" );
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