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Langmuir (1984) extends the rule on descent. He assumes the [[William W. Naismith|Naismith]]'s base speed of 5 km/h and makes the following further refinements for going downhill:<ref name=Langmuir2013 /><ref name=Langmuir1984 /><ref name=Caffin2013 />
* For a gentle decline (slopes between 5 degrees and 12 degrees) subtract 10 minutes for every 300 meters of descent
* For a steep decline (slopes greater than 12 degrees) add 10 minutes for every 300 meters of descent
Later he says that the [[Physical fitness|fitness]] of the slowest member of a party should be taken into account and thus a more practical formula for a group is:<ref name=Langmuir2013 />
* 4 [[Kilometres per hour|km/h]] + 1 h / 450 m of ascent<ref name=Langmuir2013 />
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