Arthur is going for the run. From the starting point, he runs due east at given 10 feet per second for given 250 feet. He then turns, and runs north at 12 feet per second for given 400 feet. He then turns, and runs west at given 9 feet per sec-ond for given 90 feet.
State (straight-line) distance from Arthur to the starting point as the function of t, number of seconds since he started.