Alright.
So the total area of the walkway is 60 times 2 feet. 120 feet squared.
The tiles at the hardware store are 2 by 2 feet, which means they have an area of 4 feet squared.
120/4 is 30.
From this we can deduce that we need 30 tiles to cover the walkway.
Each box has 6, so 30/6 is 5.
You would need 5 boxes of tiles to cover the walkway.
Hope I was able to help!