The contour interval on a map represents the difference in elevation between adjacent contour lines. To determine the contour interval on the map, you can look for two adjacent contour lines and subtract their elevations.
For example, if there are two contour lines on the map, one at 200m and the other at 150m, then the contour interval would be 50m (200m - 150m = 50m). This means that each contour line on the map represents a change in elevation of 50m.
So, to answer the question, you need to look at the map and find two adjacent contour lines, and subtract their elevations to determine the contour interval.
The countour interval on the map is