Question

Darian vacuums the carpet of his church once a week; it takes him 4 hours. It takes his cousin Nikki 2 hours to vacuum the church carpet. How long will it take Darian and Nikki to vacuum the church carpet if they work together?

Answer 1

1/4 + 1/2 = 1/h

3/4 = 1/h

h = 1 1/3 hours = 1 hour, 20 minutes