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Old 17th Aug 2016, 12:57
  #4 (permalink)  
Ixixly
 
Join Date: Sep 2007
Location: Brisbane, Qld
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Maths I'd say would be best, or if you have a general rule of thumb, say each thousand feet adds an extra minute to the ETA on your GPS? Either way really is fine as long as it's accurate enough.
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