I assume you want to know how many tiles or how many boxes of tile they need? I'll do both:

Since each tile covers the full 2 foot width of the walkway, we need to see how many tiles length wise we need.

60/2 = **30 tiles** needed to cover the full walkway.

Now, each box contains 6 tiles, which means we need 30 tiles/6 tiles per box = **5 boxes of tiles**