Given that design aircraft is B$747-400$ with:

Touchdown speed $=170$ knots

Runway exit speed $=45$ knots

Taxiway exit speed $=12$ knots

Aircraft lands $1500$ ft from approach threshold: taxiway exit $=35\backslash$deg

Aircraft deceleration is:

a $=-5$ ft$/$sec$2$ on the runway

a $=-3\mathrm{.}3$ ft$/$sec$2$ on the taxiway

Design a high$-$speed exit taxiway by calculating:

Distance of the taxiway exit from the threshold $($Se$)$

ft

Required length $($d$2)$ of the high speed exit

ft

Minimum separation $($X$)$ between the runway and parallel taxiway

ft

Time spent decelerating on the runway

sec