Posted by Henry on Thursday, February 5, 2009 at 11:24pm.
The grade of an incline is its vertical rise in some units per every 100 horizontal run in the same units.
so
rise/run = tan slope = .12
so slope = tan^-1 .12 = 6.8 degrees
height in miles = .12 run in miles
( the question is ambiguous. I am assuming the 4 miles is on the map, horizontal, rather than on the odometer , hypotenuse)
height change = .12*4 miles = .48 miles down
or .48*5280 = 2534 feet down
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