From a very deep portion of my fading memory, I come up with the following:
C D M V T
120 +4 124 -5 119 +8 127
224 -3 221 -4 217
317 +3 320 -5 315 -10 325
098 +2 100 - 8 097 -5 087
These are one of those 'plug in the numbers' types types of tests.
I believe MachJump has the distance questions hacked. As ever, 1' equals one mile and a diagram helps. Also remember, in real life and short distances 500 nm or so, Pythagoras works a treat.
PM