A ___ problem is a mathematical problem dealing with the distance, rate, and time of an object traveling at a uniform rate of speed.

Uniform motion problem

Step-by-step explanation:

Uniform motion problems are the problems of mathematics in which the problems are associated with distance, time, speed of the motion. The values of distance, time and rate of speed are stated in the questions. Any one value is to be found when the two are given. The distance covered by the object is calculated by multiplying the rate of the speed and the time in which the distance was covered.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

c

-by-step explanation:

it would be c