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Mainly because it doesn't make mathematical sense. Consider a vertical cliff (the problem is not really related to cycling) of say 1km. Person A: climbs up and down in 4 hours total Average 2km/4hours = 0.5km/h Person B: climbs up in 10 hours carrying a parachute and down in 36 seconds. Average (0.1km/h + 100km/h)/2 = 50km/h It doesn't make any sense ...


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You can. But to make the calculus work nicely, you need to invert it: Consider Is = 1 / s where s is speed in meter per second. If you go 100m @ 10m.s-1 and 100m @ 5m.s-1, you mean speed is sum(d) / sum(t / d) for each segment, or 6.7m.s-1 But your Is is sum(d * Is) / sum(d), or sum(d / s) / sum(d) Which is 1.5s.m-1, or (.1 + .2) / 2 So as soon as you ...



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