Answer:
Step-by-step explanation:
The student walks; 
 5 blocks west; 
 5 blocks north
 6 blocks east
 5 blocks south 
Now, distance is sum of all the length of the path covered. 
 Distance = 5 blocks + 5 blocks + 6 blocks + 5 blocks = 21 blocks
The total distance travel by the student is 21 blocks.