Answer: 7.95 miles
Explanation:
Given : The total distance walked by Bob in one day = 6000 feet
Since , 1 week = 7 days 
Then, the total distance walked by Bob in seven days is given by :-

Also, we know that 1 mile = 5280 feet.
Then, 

Now, 


Hence, he would walk 7.95 miles in one week.