How do you find rate of change using a graph?

You simply look at the coordinates, and then copare them.

Step-by-step explanation:

Lets take for example that we have both (1,2) and (2,3). When you find the rate, you find the difference, and you find the rate. That's how it's done.

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