1 7/18 or 1.39 yards
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To convert inches to yards, we need to divide the number of inches by 36 since there are 36 inches in a yard.
In this case, the snail moved 50 inches, so the distance in yards would be 50/36 yards.
Simplifying the fraction, the snail moved 1 7/18 or approximately 1.39 yards over the two-hour time period.