A machine makes 300 boxes in 15 minutes. Which expression equals the unit rate in boxes per minute

Can someone me with this problem . show your work .

Which table shows a proportional relationship between miles traveled and gas used?

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?