That depends on how fast you walk of course, but if we assume 3 miles per hour, which is pretty average, 2.5 miles should take about 50 minutes.
A brisk walk at 4 mph would take about 35 minutes. This is relatively easy on roads. Over country paths 2-3 mph is more likely.
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(3.5)/(2.5) = 35/25 = 7/5 = 1 and 2/5 hours
25 minutes.
200 / 25 = 8 hours
It takes: 2000/25 = 80 hours
25 minutes