Sandi can make a quilt in 9 days and Eva can make a quilt in 5 days. In how many days can they make a quilt working together?

Answer 1

Sandi can perform 1/9 of the task in a day

Eva can perform 1/5 of the task in a day

Working together, they can perform

1/9 + 1/5 of the task per day

= 5/45 + 9/45 = 14/45 of the task in a day

or 45/14 days in the task = 3.2 days

So

It would take about 3.2 days to complete the task working together.