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The figureabove shows the dimensions of a semicircular cross section of a one-waytunnel. The single traffic lane is 12feet wide and is equidistant from the sides of the tunnel. If vehicles must clear the top of the tunnelby at least ½ foot when they are inside the traffic lane, what should be thelimit on the height of vehicles that are allowed to use the tunnel? A. 5½ ft
B. 7½ ft
C. 8 ½ ft
D. 9½ ft
E. 10 ft |
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