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A +1.75% grade intersects a -2.25% grade at 32+50.00 and elevation 1015.00. An existing overpass is...

A +1.75% grade intersects a -2.25% grade at 32+50.00 and elevation 1015.00. An existing overpass is located at station 31+56.50. Its underside elevation is 1022.50 ft. What is the minimum curve length which will provide 12 ft of clearance under the overpass?

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