Question

The underside of a concrete bridge forms a parabolic arch that is 32 meters wide at the water level and twelve meters high in the center. The road (top of the bridge) is forty eight meters wide, and the minimum thickness of the concrete is two meters.
a road that is 48 meters wide? Man, that's some highway!

And, after all the data, just what is the question? The volume of concrete needed?

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