unographic hic map has a contour interval of 1 ft and a scal

unographic hic map has a contour interval of 1 ft and a scale of 1:600. If two adjacent map has a contour interval of 1 ft and a scale of 1 are 0.25 in. apart, what is the average slope of the ground between the contours?

Solution

contour interval = vertical height =1 ft.

Horizontal distance on map =0.25 in.

scale = 1:600

so, horizontal distance on ground = 600*0.25 =150 in.

Slope = vertical height/horizontal distance = 1/150

=0.0067