A Baseball Diamond Is a Square with Side $90 \mathrm { ft }$

Short Answer

A baseball diamond is a square with side $90 \mathrm { ft }$ . A batter hits the ball and runs toward first base with a speed of $40 \mathrm { ft } / \mathrm { s }$ . At what rate is his distance from second base decreasing when he is halfway to first base? Round the result to the nearest hundredth.