1. The problem statement, all variables and given/known data A baseball diamond is a square 90 feet on a side. A player runs from first base to second at a rate of 16 ft/sec. At what rate is the player's distance from third base changing when the player is 30 ft from first base.. 2. Relevant equations dr/dt ds/dt dx/dt? a^2+b^2=C^2 3. The attempt at a solution I have no idea... i dont know where to start, but it must be solved using the derivative.