An airplane has a speed of 600 miles per hour. At that rate, how many seconds does it take to travel a mile?

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

How is the number of vertices for a prism related to the name of the prism

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?