Solve.
-Mark and Rachel both work for Smith Landscaping Company. Mark can finish a planting job in 3 hours, while it takes Rachel 4 hours to finish the same job. If Mark and Rachel will work together on the job, and the cost of labor is $\$ 35$ per hour, what should the labor estimate be? (Round to the nearest cent, if necessary.)
A) $\$ 60.00$
B) $\$ 20.42$
C) $\$ 122.50$
D) $\$ 120.00$

Question

Quizplus · Accepted Answer

Mark's work rate is 1/3 of the job per hour, and Rachel's work rate is 1/4 of the job per hour. Together, they can complete 1/3 + 1/4 = 4/12 + 3/12 = 7/12 of the job per hour. To complete the job, it will take them 12/7 hours. The cost of labor is 12/7 hours * $35/hour = $60.

Solve -Mark and Rachel Both Work for Smith Landscaping Company $35\$ 35$35

Solve
-Mark and Rachel Both Work for Smith Landscaping Company $\$ 35$