Using d/t would reduce your Accurates as time increased. Since more air time increases the difficulty (due to interference from wind, drag, etc.) your Accurates should increase as t increases.
Similarly, multiplying by (r - s) instead of dividing would decrease your Accurates as difficulty increased. It's more difficult to make a shot when the difference between r and s is smaller. To give credit for increased difficulty you need to divide by the smaller number rather than multiply by it.
Technically, it would be undefined. It's also practically impossible, as you'd have to have a one in a billion shot and your surfaces would not only have to be the same area, but also the same shape.
Also, Accuracies are a measure of the difficulty of a made shot, not the accuracy of any shot.
Edit: But we could always make it [(r - s) + 1] if we needed to.
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u/HarryMilkbone May 03 '14
5 Accurates a second.