3 2/5miles over 7/8 of 1 hour, then divide 3 2/5 by 7/8 but now you need to have the same denominator for both fractions which would be 3 2/5 becomes 136/40 then 7/8 becomes 35/40. Now you divide 136/40 miles by 35/40 of 1 hour.
You would get the answer of 136/35 miles per hour
