Answer:
Their unit rate is 1.4 miles per hour.
Step-by-step explanation:
The family can walk [tex]\frac{2}{5}[/tex] miles in [tex]\frac{2}{7}[/tex] of an hour.
Thus, their unit rate in miles per hour can be calculated by:
[tex]\frac{2}{5}[/tex] mile divided by [tex]\frac{2}{7}[/tex] hour
[tex]\frac{2}{5}[/tex] ÷[tex]\frac{2}{7}[/tex]
[tex]\frac{2}{5}[/tex] × [tex]\frac{7}{2}[/tex]
= [tex]\frac{14}{10}[/tex]
= [tex]\frac{7}{5}[/tex]
This gives 7 miles in 5 hours.
To show the miles per hour,
1.4 miles in 1 hour.
So the family walked 1.4 miles in an hour.
