determine the gradient of a slope that starts at an elevation of 55 m and ends 20 km away at an elevation at 15 m

To calculate the gradient we can use the equation for it, which is:

change in field value / distance = gradient

Since we already know the values, we can directly go with the calculation. The change in field value is 55 m - 15 m = 40 m, and we will need to convert the 20 km into meters, so we will have 20,000 m.

40 / 20,000 = 0.002

So the gradient of the suggest slope will be only symbolic 0.002 degrees.