document.write( "Question 900790: two companies working together can clear a parcel of land in 9 hours. Working alone, it would take Company A 4 hours longer to clear the land than it would Company B. How long would it take Company B to clear the parcel of land alone? (Round off your answer to the nearest tenth) \n" ); document.write( "
Algebra.Com's Answer #546145 by Jc0110(165)\"\" \"About 
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Let a to be the time taken for Company A to clear the land, while b to be the time taken for Company B to clear the land.\r
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\n" ); document.write( "\n" ); document.write( "\"a%2Bb=9\"
\n" ); document.write( "\"a=b%2B4\" ... Substitute into \"a%2Bb=9\"
\n" ); document.write( "\"%28b%2B4%29%2Bb=9\"
\n" ); document.write( "\"b%2B4%2Bb=9\"
\n" ); document.write( "\"b%2Bb%2B4=9\"
\n" ); document.write( "\"2b%2B4=9\"
\n" ); document.write( "\"2b=9-4\"
\n" ); document.write( "\"2b=5\"
\n" ); document.write( "\"b=5%2F2\"
\n" ); document.write( "\"b=2.5\" hours *It is already rounded off to the nearest tenth*\r
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\n" ); document.write( "\n" ); document.write( "Therefore, Company B takes 2.5 hours to clear the parcel of land alone.
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