Answer:
Their unit rate is 1.4 miles per hour.
Step-by-step explanation:
The family can walk \(\frac{2}{5}\) miles in \(\frac{2}{7}\) of an hour.
Thus, their unit rate in miles per hour can be calculated by:
\(\frac{2}{5}\) mile divided by \(\frac{2}{7}\) hour
\(\frac{2}{5}\) ÷\(\frac{2}{7}\)
\(\frac{2}{5}\) × \(\frac{7}{2}\)
= \(\frac{14}{10}\)
= \(\frac{7}{5}\)
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.
