Question: Problem Solving (corrected forum)

Hello,
Not to be a bother, but I have question about problem solving:

A baseball diamond is a square with side 90ft. A batter hits the ball and runs toward first base with a speed of 24ft/s.
a) At what rate is his distance from second base decreasing when he is halfway to first base?
b) At what rate is his distance from third base increasing at the same moment?

This question is worded strangely so thats what I'm having trouble approaching it, but it has to do with related rates.

Thanks in advance

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