Can someone plug some numbers into a small equation real quick for me? : ) -1, -7, -13, -19 plug into sn = n/2(a1+an)

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

by definition, an arc subtended by a central angle of some given measure has the same measure. so .