SOLUTION: 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 nea

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
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
a) 1/5+1/4=1/x
x = 20/9= 2 2/9=2.2 minutes
b) 2/5+2/4+2/y=1
y=20
2/20=1/10
It has to do 1/10 of the job to help do the job in exactly 2 minutes

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