document.write( "Question 1033132: A chemistry experiment requires that a vacuum be created in a chamber. A small vacuum pump requires 15 seconds to evacuate the chamber. Working together, the chamber can be evacuated in 4 sec. Find the time required for the larger vacuum pump working alone to evacuate the chamber. \n" ); document.write( "

Algebra.Com's Answer #647715 by fractalier(6550) $\"\"$ $\"About$

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The set up is like this:
\n" ); document.write( " $\"t%2FA+%2B+t%2FB+=+1\"$
\n" ); document.write( "where A and B are the times working alone and t is the time working together...thus we have
\n" ); document.write( " $\"4%2F15+%2B+4%2FB+=+1\"$
\n" ); document.write( "Multiply by 15B and get
\n" ); document.write( " $\"4B+%2B+60+=+15B\"$
\n" ); document.write( " $\"11B+=+60\"$
\n" ); document.write( "and
\n" ); document.write( " $\"B+=+60%2F11\"$ hours \n" ); document.write( "

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