ake a Test - Monica Akumu-Google Chrome Secure https:/ mathxl.com/Student/Player

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ake a Test - Monica Akumu-Google Chrome Secure https:/ mathxl.com/Student/Player Test.aspx/testid-1582152528centerwin-yes Math 1140 Summer 2017 Test: Unit Exam # 6 (over Chapter 7) Time Remaining:01:51:12 Submit Test This Question: 1 pt This Test: 22 pts possible 10 of 22 Working together, it takes two roofers 8 hours to put a new roof on a portable classroom H the first rooter can do the job by himselfin 10 hours, how many hours will take the second roofer to do the job by himself? hours (Type an integer or a decimal ) The second roofer can do the job in

Explanation / Answer

let x be first roofer ( 1/x is one hour work)

y be second roofer ( 1/y is one hour work)

both can do that work in 8 hours.

both one hour work is 1/8

1/X+ 1/y= 1/8

a one hour work is 10

1/10 +1/y = 1/8

1/y =1/8 - 1/10

1/y =1/40

second roofer can do that job in 40 hours

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