document.write( "Question 768464: Kayla's copy store recived an order for 5,616 copies. The store has 3 printers. If Kayla only uses one printer at a time, the first printer would complete the job in 15 hours and 36 minutes, the second in 7 hours and 12 minutes, and the third in 11 hours and 42 minutes. How long would it take to process if all three printers were used at the same time?
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Algebra.Com's Answer #468289 by Edwin McCravy(20060) $\"\"$ $\"About$

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Kayla's copy store recived an order for 5,616 copies. The store has 3 printers. If Kayla only uses one printer at a time, \r
\n" ); document.write( "\n" ); document.write( "the first printer would complete the job in 15 hours and 36 minutes,
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document.write( "That's 15·60 + 36 = 900 + 36 = 936 minutes\r\n" );
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document.write( "So the first printer's rate is 5616 copies per 936 minutes or  = 6\r\n" );
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\n" ); document.write( "the second in 7 hours and 12 minutes,
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document.write( "That's 7·60 + 12 = 420 + 12 = 432 minutes\r\n" );
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document.write( "So the second printer's rate is 5616 copies per 432 minutes or  = 13\r\n" );
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\n" ); document.write( "and the third in 11 hours and 42 minutes.
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document.write( "That's 11·60 + 42 = 660 + 42 = 702 minutes\r\n" );
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document.write( "So the third printer's rate is 5616 copies per 702 minutes or  = 8\r\n" );
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document.write( "The combined rate of all three printers is 6+13+8 or 27 copies per minute.\r\n" );
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document.write( "27 copies is to 1 minute as 5616 copies is to x minutes:\r\n" );
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document.write( "17x = 5616\r\n" );
document.write( "  x =  = 208 minutes = hours = hours = 3 hours 28 minutes.\r\n" );
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document.write( "Edwin

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