3/10 inches x inches
---------------- = -------------
7/8 miles 1 miles
using cross products
3/10 * 1 = 7/8 * x
multiply by 8/7
3/10 * 8/7 = 7/8 *8/7*x
24/70 = x
divide by 2
12/35
12/35 inches per 1 mile
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