Assignment:
Alice watched an ant hunting for food. The ant was traveling in a straight line toward a crumb on the floor. Suddenly, it turned around and crawled 8 inches back to Alice's shoe. Another ant joined it and together they hurried 13 inches back toward the crumb. The two ants stopped and came back 4 inches toward Alice's shoe. Finally, they turned around and raced 7 inches to the crumb. How far was the crumb from Alice's shoe?
Provide complete and step by step solution for the question and show calculations and use formulas.