Hi could you please help solve this questions in typed text using the knowledge in math modeling ? Thanks a lot!

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

When turned about its axis of rotation, which shape could have created this three-dimensional object?

Write an equation for the function that includes the points (2,100)and (3,100)