document.write( "Question 983015: A work crew has a new pump and an old pump. The new pump can fill a tank in 5 hours, and the old pump can fill the same tank in 7 hours. Write and solve and equation for the time it will take both pumps to fill one tank if the pumps are used together. \n" ); document.write( "
Algebra.Com's Answer #603833 by stanbon(75887)\"\" \"About 
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A work crew has a new pump and an old pump. The new pump can fill a tank in 5 hours, and the old pump can fill the same tank in 7 hours. Write and solve and equation for the time it will take both pumps to fill one tank if the pumps are used together.
\n" ); document.write( "----------
\n" ); document.write( "new pump rate:: 1/5 job/hr
\n" ); document.write( "------
\n" ); document.write( "old pump rate:: 1/7 job/hr
\n" ); document.write( "------
\n" ); document.write( "together rate:: 1/x job/hr
\n" ); document.write( "----------
\n" ); document.write( "Equation:
\n" ); document.write( "rate + rate = together rate
\n" ); document.write( "1/5 + 1/7 = 1/x
\n" ); document.write( "7x + 5x = 35
\n" ); document.write( "12x = 35
\n" ); document.write( "x = 35/12 = 2 11/12 hr = 2hr 55 min (time to do the job together)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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