The cain family drove for 1 hour and 15 minutes and arrived at their camping spot at 3: 44 p. m. what time did the cain family start driving

when you subtract that the answer will be 2:29

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.