Question

Mari and Liam can each wash a car and vacuum its interior in 2 hours. Zach needs 3

hours to do this same job alone. If Zach, Liam, and Mari work together, how long will it
take them to clean a car?

Answer 1

45 min

Explanation:

Answer 2

2+2+3=7

7/3=2.33

2.33/3=0.78 hours

46 minutes 12 second

It would take them 46 minutes 12 seconds to clean the car if they worked together.