Problema Solution
Highway 195 into Lewiston, Idaho undergoes a difference in elevation of 1800 feet in 7 miles. What is the average percent slope of the Lewiston grade?
Answer provided by our tutors
1 mi = 5280 ft
7 mi = 5280*7 ft
rise = 1800 ft
run^2 = (5280*7)^2 - 1800^2
run = 36,916.14 ft
Percent slope = (rise/run)*100
Percent slope = (1800/36916.14)*100
Percent slope = 4.86%
The average percent slope is 4.86% approximately.