Imagine you have four empty buckets in which to put any of the four letters Y, A, R, D into. At first you have four letters that can be placed in any of the four empty buckets. Once you've placed a letter in a bucket you only have three letters and three empty buckets to choose from. And so on... So there are 4x3x2x1 = 24 permutations of the word YARD.
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The answer is a yard
1 cubic foot = 1,728 cubic inches1 cubic yard = 27 cubic feet = 46,656 cubic inches1 ft = 12 inches40 ft = 480 inchesVolume of the walk = (48" x 480" x 3.5") = 80,640 cubic inches = 1.7284 cubic yard (rounded)