document.write( "Question 547216: Ben can paint a fence in 3 hours and Billy takes 4 hours. How long will it take them to painting together \n" ); document.write( "
Algebra.Com's Answer #356293 by nerdybill(7384)\"\" \"About 
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Ben can paint a fence in 3 hours and Billy takes 4 hours. How long will it take them to painting together
\n" ); document.write( ".
\n" ); document.write( "Let x = time (hours) it takes for both
\n" ); document.write( "then
\n" ); document.write( "x(1/3 + 1/4) = 1
\n" ); document.write( "multiplying both sides by 12:
\n" ); document.write( "x(4 + 3) = 12
\n" ); document.write( "x(7) = 12
\n" ); document.write( "x = 12/7
\n" ); document.write( "x = 1.71 hours
\n" ); document.write( "or
\n" ); document.write( "x = 1 hour and 43 minutes \n" ); document.write( "
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