Nicholas and his wife are planting vegetables on their farm. Nicholas has finished planting 18 rows of carrots so far and is planting new rows at a rate of 1 row per hour. His wife has finished 5 rows of tomatoes and will continue
planting at 2 rows per hour. They want the same amount of carrots and tomatoes, so they will stop when they have
planted the same amount of rows of each vegetable. At what point will they have planted the same amount of tomatoes
as carrots, and how many will that be?