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Quick math help
What can I say, I'm a writer, not a math guy. Good thing I wasn't once responsible for comp'ing firing solutions applied to howitzers before they fired a 96lb, 155mm round down...oh, yeah...forgot about that 
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Anyway, gimme some digits, thanks!
Billy = 60' ride @ .80 IF = xxx TSS
Timmy = 90' ride @ .73 IF = xxx TSS
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Billy = 64 TSS
Timmy = 80 TSS
-or- 25% more TSS in 50% more time...
TSS = IF^2 * duration (in hours) * 100