Suppose a police officer is 1/2 mile south of an intersection, driving north towards the intersection at 50mph. At the same time, another car is 1/2 mile east of the intersection, driving east (away from the intersection) at an unknown speed. The officers radar gun indicates 25mph when pointed at the other car (that is, the straight line distance between the officer and the other car at a rate of 25mph). What is the speed of the other car? (I know how to answer this question, so Imposting the question and the answer)