Answer
$\frac{3}{20}$
Work Step by Step
The slope measures the ratio of the vertical change to the horizontal change between 2 points on a line.
We can write the slope as m= (vertical change)/(horizontal change)
In this example, the vertical change of the plane is 15 feet and the horizontal change is 100 feet.
Therefore, $m=\frac{15}{100}=\frac{3}{20}$