If melba rode her bike 7/8 miles in 1/4hour. what is the unit rate in miles per hour

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Cone a has a surface area of 384 ft2 and cone b has a surface area of 96 ft? . what is the ratio of their volume?