Ralph can paint a room in 2 hours, and joy can paint the same room in 3 hours. if they work together, how long would it take them to paint the room?

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.

Which one ? is the answer and how to find this answer

How do you find the circumfrance of a circle?