Answer to Question #1990 in Calculus for Jess

Question #1990
A high-speed bullet train accelerates and decelerates at the rate of 5 ft/s2. Its maximum cruising speed is 90 mi/h. (Give your answers correct to one decimal place.)

(a) What is the maximum distance the train can travel if it accelerates from rest until it reaches its cruising speed and then runs at that speed for 15 minutes?

_____________________ mi

(b) Suppose that the train starts from rest and must come to a complete stop in 15 minutes. What is the maximum distance it can travel under these conditions?
______________________ mi

(c) Find the minimum time that the train takes to travel between two consecutive stations that are 45 miles apart.
_________________________ min

(d) The trip from one station to the next takes 37.5 minutes. How far apart are the stations?
_________________________ mi
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