Question

Lyle can paint a room in 3 hours. Selena can paint a room with the same dimensions in 2 hours. If they work together, how many hours does it take them to paint the room? Round your answer to the nearest tenth?

Answer 1

Lyle covers 1/3 room per hour.
Selena covers 1/2 room per hour.
Working together, they cover (1/3 + 1/2) = 5/6 room per hour.

That unit rate is the same as (6/5) = 1.2 hour per room.