A baseball diamond is a square 90 ft on a side. A player runs from first base to second at a rate of 14 ft/sec.
a) At what rate is the player's distance from third base changing when the player is 15 ft from first base?
b) At what rate are angles theta 1 and theta 2 changing at that time? Use radicals in your answer.

Please explain how to solve this step-by-step. Thank you!

Image is available here: http://i.imgur.com/29tUypH.png

Question

A baseball diamond is a square 90 ft on a side. A player runs from first base to second at a rate of 14 ft/sec. 
a) At what rate is the player's distance from third base changing when the player is 15 ft from first base? 
b) At what rate are angles theta 1 and theta 2 changing at that time? Use radicals in your answer.

Please explain how to solve this step-by-step. Thank you!

Image is available here: http://i.imgur.com/29tUypH.png