document.write( "Question 311925: Word Problem. Solve the problem.
\n" ); document.write( "Two pipes can fill a large tank in 10 hours. One of the pipes, used alone, takes 15 hours longer than the other to fill the tank. How long would each pipe take to fill the tank alone? Show your work.
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Algebra.Com's Answer #223043 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
Let \"x\" = time it takes one pipe to fill tank in hrs
\n" ); document.write( "Then \"x+%2B+15\" = hrs other pipe takes to fill tank
\n" ); document.write( "Add the rates of each pipe to fill tank to get
\n" ); document.write( "the rate of both filling tank together
\n" ); document.write( "(1 tank/x hrs) + (1 tank/x + 15 hrs) = (1 tank/10 hrs)
\n" ); document.write( "\"1%2Fx+%2B+1%2F%28x+%2B+15%29+=+1%2F10\"
\n" ); document.write( "Multiply both sides by \"x%2A%28x+%2B+15%29%2A10\"
\n" ); document.write( "\"10%2A%28x+%2B+15%29+%2B+10x+=+x%2A%28x+%2B+15%29\"
\n" ); document.write( "\"10x+%2B+150+%2B+10x++=+x%5E2+%2B+15x\"
\n" ); document.write( "\"x%5E2+-+5x+-+150+=+0\"
\n" ); document.write( "Use quadratic formula
\n" ); document.write( "\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"
\n" ); document.write( "\"a+=+1\"
\n" ); document.write( "\"b+=+-5\"
\n" ); document.write( "\"c+=+-150\"
\n" ); document.write( "\"x+=+%28-%28-5%29+%2B-+sqrt%28+%28-5%29%5E2-4%2A1%2A%28-150%29+%29%29%2F%282%2A1%29+\"
\n" ); document.write( "\"x+=+%285+%2B-+sqrt%28+25+%2B+600+%29%29%2F2+\"
\n" ); document.write( "\"x+=+%285+%2B+25%29%2F2\"
\n" ); document.write( "\"x+=+15\" (there is a (-) answer, but I can't use it
\n" ); document.write( "\"x+%2B+15+=+30\"
\n" ); document.write( "One pipe takes 15 hrs
\n" ); document.write( "the other pipe takes 30 hrs
\n" ); document.write( "check:
\n" ); document.write( "\"1%2F15+%2B+1%2F30+=+1%2F10\"
\n" ); document.write( "multiply both sides by \"30\"
\n" ); document.write( "\"2+%2B+1+=+3\"
\n" ); document.write( "OK
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