document.write( "Question 1146094: There are two machines that produce aluminum cans. The newer machine can produce 7200 cans in 180 minutes. It takes the older machine 360 minutes to produce that many cans. If the two machines work together, how long will it take them to produce 7200 cans? \n" ); document.write( "

Algebra.Com's Answer #767370 by VFBundy(438) $\"\"$ $\"About$

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In all the examples, 7200 cans are produced. So, from this point forward, think of producing 7200 cans as the completed job. (Meaning, in your calculations, you will not have to concern yourself with the number 7200 again.)
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\n" ); document.write( "New machine's rate of work = 1/180 job per minute
\n" ); document.write( "Older machine's rate of work = 1/360 job per minute
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\n" ); document.write( "Rate of work of both machines working together = 1/180 + 1/360 = 2/360 + 1/360 = 3/360 = 1/120 job per minute
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\n" ); document.write( "Since both machines working together do 1/120 job per minute, it stands to reason that it takes 120 minutes to complete the job. \n" ); document.write( "

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