400
The pilot, Chase, took off and reached an altitude of 10,000 feet in 25 minutes. How many feet per minute, on average, did the airplane climb?
He went 10,000 feet in 25 minutes and you want to know how far he went in 1 minute (which is also called a unit rate). So you DIVIDE 10,000 by 25.
Answer: 400 feet per minute