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 Time part of window washed

lea 1/80 T 1/80 t

Marie ? T 1/60 t

Answer 1

A

Explanation:

Answer 2

The missing value is 1/60.

Explanation:

Given,

The time taken by Marie to work alone = 60 days,

Since,

`\text{Work done in one day}=\frac{1}{\text{Time taken in days}}`

Thus, the work done by Marie in one day =
`(1)/(60)`,

Hence, the rate of Marie = 1/60 per day,

Which is the missing value in the table.