Consider an airplane patterned after the Fairchild Republic A$-10,$ a twin$-$jet attack aircraft. The airplane has the following characteristics: wing area $=47m^2,$ aspect ratio $=6\mathrm{.}5,$ Oswald efficiency factor $=0\mathrm{.}87,$ weight $=103,047N,$ and zero$-$lift drag coefficient $=0\mathrm{.}032.$ The airplane is equipped with two jet engines with $40,298$ of static thrust each at sea level. The thrust$-$specific fuel consumption is $1\mathrm{.}0$ N of fuel per Newton of thrust per hour. The fuel capacity is $1600$ gal $,$ and the maximum gross weight is $136,960N.$ Calculate the range and endurance at a standard altitude of $8$ km $,$ where ${}_{}=0\mathrm{.}526k\frac{g}{m^3}.$

The range of the twin$-$jet aircraft at an altitude of $8$ km is $$ The endurance of the twin$-$jet aircraft at an altitude of $8$ km is: hr$.$