It is pretty small for me on mobile. If it is supposed to say km, that doesn't make much sense either with kmh. Look at the first point with 2000 miles.
High range jet kmh: 2000 / 900 = 2.2
Low range jet kmh: 2000 / 750 = 2.6
Yet the point is about 3+ hours. Hundreds of km unaccounted for?
Ok, expand the graph, and you will see the 1st point is at 3 hours, not 3+ as you suggest.
You provide figures for CRUISING speed, when the plane is up to speed, and not either accelerating or decelerating. The plane does not take off at 750 Km/Hr or land at that speed either. I dont know if you have ever been in a plane, but i do many times a year, and they dont tear along at cruising speed and just stop.
They slow down and take their time landing.
Your time difference of 0.4 of an hour (24 minutes) is easily covered by accelerating, and de accelerating upon take of and landing. You also choose the one point that will have the most error due to the necessary take of and landing cycle.
You really are stubborn, you think you got a slam dunk, but then it takes time to point out you are completely off track with units, but you persist in trying to prove your point, only to be told further you are not right.
It must be embarrassing to be wrong so often, and on so many silly, childish mistakes....