document.write( "Question 1033131: A chemistry experiment requires that a vacuum be created in a chamber. A small vacuum pump requires 30 seconds to evacuate the chamber. The large vacuum pump requires 20 seconds to evacuate. Find the time required for both pumps working together to evacuate the chamber. \n" ); document.write( "
Algebra.Com's Answer #647711 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
A chemistry experiment requires that a vacuum be created in a chamber. A small vacuum pump requires 30 seconds to evacuate the chamber. The large vacuum pump requires 20 seconds to evacuate. Find the time required for both pumps working together to evacuate the chamber.
\n" ); document.write( "------------
\n" ); document.write( "small pump rate:: 1/30 job/sec
\n" ); document.write( "large pump rate:: 1/20 job/sec
\n" ); document.write( "---
\n" ); document.write( "together rate:: 1/x job/sec
\n" ); document.write( "------
\n" ); document.write( "Equation:
\n" ); document.write( "rate + rate = together rate
\n" ); document.write( "1/30 + 1/20 = 1/x
\n" ); document.write( "30x + 20x = 30*20
\n" ); document.write( "50x = 600
\n" ); document.write( "x = 12 sec/job (time to do the job together)
\n" ); document.write( "------------
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( "============
\n" ); document.write( " \n" ); document.write( "
\n" );