document.write( "Question 550198: One pipe can fill a tank in 30 mins but a second pipe can fill it in 25 mins. How long will it take if both pipes are used? \n" ); document.write( "
Algebra.Com's Answer #358532 by nerdybill(7384)\"\" \"About 
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One pipe can fill a tank in 30 mins but a second pipe can fill it in 25 mins. How long will it take if both pipes are used?
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\n" ); document.write( "Let x = time (mins) it takes for both
\n" ); document.write( "then
\n" ); document.write( "x(1/30 + 1/25) = 1
\n" ); document.write( "multiplying both sides by (30)(25):
\n" ); document.write( "x(25 + 30) = (30)(25)
\n" ); document.write( "x(55) = 750
\n" ); document.write( "x = 750/55
\n" ); document.write( "x = 13.6 minutes\r
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