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Here is a link to the question:This is another question about parabola?This is another question about parabola.

A tunnel is to built to allow 2 lanes of traffic to pass from one side of a mountain to the other side. The largest vehicles are trucks, which can be considered as rectangles 5m wide and 7m high.

Investigate the cross-section of a parabolic tunnel and find a possible equation to represent it. Allow some space so trucks do not bump into each other or the sides of the tunnel.

This is another question about parabola? - Yahoo! Answers

I have posted a link there so the OP can find my response.