*PLEASE HELP QUESTION ATTACHED*

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?