Please help. A man can paint a door in 1 ¼ hour. How many similar doors can he paint in 7 ½ hours?

A turtle can walk 1/12 of a kilometer in an hour. The turtle is 1/5 of a kilometer away from the pond. At this speed, how long will it take the turtle to reach the pond?

A piano teacher has 4½ hours available to teach at night. Each lesson will last 1½ hours. How many lessons can the teacher schedule in a night?

Nicole is playing a video game where each round lasts 7/12 of an hour. She has scheduled 3 ¾ hours to play the game. How many rounds can Nicole play?

Mrs. Harrison used 16 ounces of dark chocolate while baking. She used 2/5 of the chocolate to make some frosting and used the rest to make brownies. How much more chocolate did Mrs. Harrison use in the brownies than in the frosting?