We are given that Elena ran 2 1/2 miles.
First, convert the mixed fraction to proper fraction.

Now we are also given that there are 5,200 feet in 1 mile.
So we can convert the miles into feet as,

Therefore, Elena ran 13,000 feet.
Similarly,
We are also given that there are 12 inches in 1 foot.
So we can convert the feet into inches as,

Therefore, Elana ran 156,000 inches.
Summary:
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