Question 861512
I assume the cycle starts at the first crack where his heels start.

No, it states" If he starts his walk with both heels just barely past a crack,"
Use decimals
5.25 =5 1/4 or 21 /4
2.75=2 3/4 or 11/4
Good point about not knowing the size of his foot but his pace or stride is 2 3/4 feet long