申論題

2. A man runs twice as fast as he swins. He is at point A on the edge of a circular pool with radius 20 meters and he wants to get to the diametrically opposite point B as quickly as possible. He can run around the edge to a point C and then swim directly from C to B.

(b) (6 pts) If he runs m tines as fast as he swims, how will his best strategy be modified as m varies (m ≥ 1) ?