A baseball diamond is a square with side 90 ft. A batter hits the bali and runs toward first base with a speed of 30 i'tjs. 0/ 4% 90 f1 0/ (a) At what rate is his distance from second base decreasing when he is halfway to first base? (Round your answer to one decimal piece.) -13.4 X x; (b) At what rate is his distance from third base increasing at the same moment? [Round your answer to one decimai place.) 13.4 v this