Answer:
- Maribel needs to travel 0.75 miles to reach the Post Office.
 
Explanation:
We know that:
- 1 3/4 = Miles to Post Office
 
Work:
- Home => Park (3/5 miles)
 - Park => School (3/5 + 2/5 miles)
 - => School => Post Office (7/4 - 5/5 miles)
 - => School => Post Office (7/4 - 4/4 miles)
 - => School => Post Office (3/4 miles)
 
Hence, Maribel needs to travel 0.75 miles to reach the Post Office.
Hoped this helped.
