Puzzle for November 10, 2008

Yesterday was the 19th anniversary of the fall of the Berlin Wall. Then today in 1989, celebrating Germans began tearing down the physical wall which was collected by souvenir hunters.

The Berlin Wall split Germany into East and West portions as a result of the conclusion of World War 2. It was constructed of concrete, seven and a half miles long, and twelve feet high. It was part of a 102-mile system of fortifications encircling West Berlin. The fortifications were built in stages and included military watchtowers, tripwires, and minefields. A constant stream of escape attempts highlighted the repression of the Communist regime.

The wall was built in 1958. If it was 2 feet wide, how many cubic feet of concrete were used in its construction?

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