document.write( "Question 238195: if mary paints a room in 3hours and john paints it in 4hours. how many hours for mary and john to paint the same room? \n" ); document.write( "
Algebra.Com's Answer #175036 by JimboP1977(311)\"\" \"About 
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1/3+1/4 = 1 hour\r
\n" ); document.write( "\n" ); document.write( "7/12 room done in 1 hour\r
\n" ); document.write( "\n" ); document.write( "so whole of the room done in 1/(7/12) = 12/7 hours = 1 hour 42 mins and 52 seconds\r
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