Usually folks figure sand at 100 pcf. There are 27 cubic feet in a cubic yard. So to continue the answer the previous poster made... Using the 100 pcf average weight for sand, and that there are 27 cubic feet in a yard, then 2 yards is equal to 54 cubic feet and at 100 pcf, the total weight is 5400 lbs, or 2.7 tons.
The walking distance measure denotes the distance that can be travelled by walking in a fixed amount of time. In Japan, the standard measure for walking distance is 80 meters for 1 minute of walking time. It is the standard used in real estate listings. For example, if a building is a 10 minute walk from a particular park or train station, it is 800 meters away.
A good average walking pace for a woman is three miles per hour or one mile every twenty minutes. For a man the average speed is three and a half miles per hour. This pace is adequate for healthy living. Walking at this pace for thirty minutes five or six days per week will reduce the risk of heart disease, type two diabetes and reduce anxiety and stress.