New physics question

[sniper7]

so if you are driving 65mph and there is a fly in the back of your vehicle, and he flies from there to the front window ...How fast is he going?

He would actually have a couple speeds. he would have 65mph + his forward airspeed, call it 5 mph. relative to the earth he would be doing 70mph. relative to the car, he would be doing 5 mph.
his airspeed would read 5mph if he were an airplane unless he went out the window, he would instantly receive a 65mph headwind and being doing 70mph but would quickly slow because of the drag on him, plus not having the required amount of thrust/power/wingspeed in order to maintain that speed.

[two shoes]

You meant inside the car.... shit I am still not a rocket scientist...

Some things still apply though....His speed relative to a fixed point on the ground would be greater than 65, but the fly does not have to overcome the wind resistance outside....