Selena has hiked 2 1/2 miles in 2 hours she still has 3 3/4 miles to go about how much longer will it take her to finish the hike using the same pace

 2 1/2 divided by 2 = 1 1/4 miles per hour

3 3/4 divided by 1 1/4 = 3 more hours

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.