1 inch on the map = 50 miles on the Earth.
A certain trip on the map is 2-3/4 inches.
-- first inch = 50 miles
-- second inch = another 50 miles
-- 3/4 inch = 3/4 of 50 miles (37.5 miles)
Total:
Here's an equation;
1 map-inch = 50 real-miles
Multiply each side by 2-3/4 :
2-3/4 inches = (2-3/4) x (50 miles)
2-3/4 map-inches = 137.5 real-miles
