document.write( "Question 812798: Thomas' snowplow can clear 1000 feet of roadway of a 9 inch snowfall in 5 minutes. Henry's snowplow can clear 1000 feet of roadway of a 9 inch snowfall in 4 minutes. a.) to the nearest tenth of a minute, in how many minutes can their two plows together clear a 1000 foot stretch of a 9 inch snowfall. b.) a third plow, old and slow is available. how fast must it work under the same conditions with the two plows to clear the 1000 feet in exactly 2 minutes \n" ); document.write( "

Algebra.Com's Answer #489363 by richwmiller(17219) $\"\"$ $\"About$

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a) 1/5+1/4=1/x
\n" ); document.write( "x = 20/9= 2 2/9=2.2 minutes\r
\n" ); document.write( "\n" ); document.write( "b) 2/5+2/4+2/y=1
\n" ); document.write( "y=20
\n" ); document.write( "2/20=1/10
\n" ); document.write( "It has to do 1/10 of the job to help do the job in exactly 2 minutes\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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