The table below gives the value of a car over two years. using an exponential best-fit model, after how many years is the car valued at 45% of the original value?
year 0 0.5 1.0 1.5 2.0
value ($) 15,500.00 14,560.00 13,911.20 12,969.66 12,204.09

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