PLEASE HELP!!
A plane is going to fly 400 miles at a planned speed of 570 mph. The flight will have an average headwind of w miles per hour the entire time, meaning the plane is flying directly against the wind. The time T, in hours, of the flight is a function of the speed of the headwind w, in mph, and can be modeled by
T(w) = 400/570 - W

a) What does T(150) mean in this situation?

b) At what value of w does the graph have a vertical asymptote? Explain how you know and what this asymptote means in the situation.