STEP 1
Find miles per minute; divide total miles by number of minutes
= 1.5 miles ÷ 35 minutes
= 0.0428571429 miles per minute
STEP 2
find miles per hour; multiply step 1 answer by 60 minutes per hour
= 0.0428571429 * 60
= 2.5714285714 miles per hour
ANSWER: Fifi walked 2.57 miles per hour
Hope this helps! :)