My players recently started the Tomb of Annihilation adventure. In Chapter 2, under the heading "Tracking Miles" (p. 38), it says:
Instead of tracking movement by hexes, you can keep track of the actual distances covered (10 miles per day at a normal pace, 15 miles per day at a fast pace, or 9 miles per day at a slow pace), [...]
A character with a flying speed of 30 feet can travel 4 miles per hour.
Comparing this to the Travel Pace table in the PHB (p. 182):
|Pace||/Hour||/Day(~×8)||The math is always a little wonky (for simplicity?)|
|Fast||4 miles||30 miles||→ 30 ×.5 = 15 miles (OK)|
|Normal||3 miles||24 miles||→ 24 ×.5 = 10 miles (-2 miles a day)|
|Slow||2 miles||18 miles||→ 18 ×.5 = 9 miles (OK)|
A player asked: If his ranger chose forest for the Natural Explorer feature, then when in the "jungle" (a terrain common in Chult), could the group travel twice as far? The reasoning was that they felt ToA was halving the travel pace due to the implicit difficult terrain, which would be negated by the ranger's Natural Explorer feature:
Choose one type of favored terrain: arctic, coast, desert, forest, grassland, mountain, swamp, or the Underdark...While traveling for an hour or more in your favored terrain, you gain the following benefits: Difficult terrain doesn’t slow your group’s travel...