Question

lea and marie are washing all the windows in their house. it would take lea 80 minutes to wash the windows by herself, and it would take marie 60 minutes to wash them by herself. lea creates a table so she can find out how long it will take to wash the windows if they work together. what is the missing value in the table that represents the rate for marie?

	rate (part/min)	time (min)	part of windows washed
marie	?	\\(t\\)	\\(\frac{1}{60}t\\)

Explanation:

Step1: Understand Work Rate Concept

Work rate is part of work per unit time. For Marie, total time alone is 60 minutes to complete 1 job (wash all windows).

Step2: Calculate Marie's Rate

Rate = 1 job / total time. So Marie's rate is $\frac{1}{60}$ part per minute.

Answer:

$\frac{1}{60}$