Answer :

You just have to divide the miles by the days.
6.41/7=.9157 miles, or .9
One week = Seven days
6.41 miles/ one week =
6.41 miles / 7 days
Simplify...
(6.41 miles / 7) / (7 days / 7)
.92 miles / 1 day
Melissa walks about .92 miles a day.
Hope this helps!