Solve for x.
2x - 8 = -2

2x - 8 = -2

2x = -2 + 8

2x= 6

x = 6/2

x = 3

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m

a² + b²= c²

24² + 7² = c²

c= 25