Question

nnette can repair a refrigerator in 60 minutes. Liza can repair a refrigerator 20 minutes faster. If they work together, how many minutes does it take them to repair the refrigerator?

Answer 1

@satellite73

Answer 2

Annette: 1 repair in 60 minutes
In 1 minute, she does 1/60 of the repair

Liza: 1 repair in 20 minutes.
In 1 minute, she does 1/20 of the repair

Working together, it takes them x minutes to repair the refrigerator, so
in 1 minute, they do 1/x of the refrigerator repair.

1/60 + 1/20 = 1/x

Answer 3

Solve for x.