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Answers by Solomon F.

 Before studying, sit in a quiet place and for 5 minutes try to think of nothing. For every 20 minutes of studying, spend one minute stretching or walking. Get your mind right for a few minutes by listening to classical music if you can't just empty your mind of everything. 

After the first hr, Pat is ahead by one mile, which takes Kim an extra 6.67 minutes. So now you know it has to be a little longer than 10 miles, because Pat runs 10 miles 60 minutes, and Kim runs 10 miles in 1.1hrs or 67 minutes -- a difference of almost 7 minutes   If the race is 12...