The calculus question I recall is
It’s snowing at a rate of 3 inches per hour.
Plowman Jack can clear five miles of road per hour.
There are 128 miles of road for Plowman Jack to clear.
If Plowman Jack starts plowing right away, he’s losing money.
If Plowman Jack starts plowing too late, he’s losing money.
When is the optimal time for Plowman Jack to begin plowing?
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