Design a High Speed Exit Taxiway by calculating: a. Distance of the taxiway exit from the threshold (Se) [a.] b. Required length (d2) of the high speed exit [b.] c. Minimum separation (X) between the runway and parallel taxiway [c.] d. Time spent decelerating on the runway [d.] Given: Design aircraft is B747-400 with Touchdown speed = 170 miles per hour Runway exit speed = 45 miles per hour Taxiway exit speed = 12 miles per hour Aircraft lands 1500 ft from approach threshold Taxiway Exit = 35 Aircraft deceleration is: a = -5 ft/sec2 on the runway a = -3.3 ft/sec2 on the taxiway