Russ P. answered 10/09/14
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Taryn,
By evenly the problem means that if you layed all the strides side by side, then the last one would end exactly on the finish line. Or more simply, if you divide the course length by the stride, the Remainder would be zero. There are no even or odd groups to worry about.
So 138,435 / 3 = 46,145 strides exactly, so the strides fit evenly into the course.
BTW, I could have a stride of 3.2 ft and win the race even though 138,435 / 3.2 = 43,260.9375 doesn't fit evenly. Then my last stride would land beyond the finish line and not just on it.
Taryn S.
10/09/14