Hello!
Answer:

Explanation:
→ We want how many miles can he walk in one hour.
→ We know that Marshall walks 2 miles in 2/3 of an hour.
→ We know that 2/3 hour is equal to 40 minutes.
→ So, we have this table:
Distance (miles) 2 x
Time (minutes) 40 60
→ To solve x, let's apply the method of the cross:

→ Simplify the equation:

Conclusion:
Marshall walks 3 miles in 1 hour.