18MPH means you can go 18 miles in 60 minutes.
36 miles in 120 minutes, 54 miles in 180 minutes, etc.
For running, that's fast.
However, if you were in a car, the speed would seem slow.
It all depends how to look at it. Perspective
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13.5 miles at 18mph from house to school
if your going 75 mph then itll take you about 2 hours 37mph = 4 hours 18mph = 8 hours 9mph = 16 hours
as fast as, so fast as. faster than... less fast than...
The future tense of the verb form of "fast" is will fast.
Fast!