[crznp]

The advantage of driving faster is that you convert driving time into free time.

Death converts living time (including free time) into death time.

Subtracting them makes mathematical sense: you have more or less free time. Though it is napkin math. Eg: it treats all free time as equivalent. If speeding gets you to a job interview on time, which gets you the job, that is more important than speeding so that you have time to do a crossword.

Might as well do the crossword in the car, eh?