Is the earth flat? When did you start the stopwatch?
Of course the earth is flat and vehicles are either stationary or going flat-out Charlie. Obviously there is no lapse-rate or you would have mentioned it. So the temperature is everywhere invariant unlike a round earth for which constants aren't and variables won't. So on a flat earth with everything under the flat sun constant speed is everywhere constant therefore distance is defined by time. Being at 1000ft I saw the pub open with my eagle eye and instantly flicked my stop watch on. You on the other hand left your glasses at home, are blind as a bat and did not hear the click. So you did not synchronise watches. Therefore you turned up late and its your round. Mine is a Tooheys and I'm drier than a pommie's towel.