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A tangent section of highway has a -1.0% grade and ends at station 0+145 and elevation...

A tangent section of highway has a -1.0% grade and ends at station 0+145 and elevation 26 m. It must be connected to another section of highway that has a -1.0% grade and that begins at station 1 + 350 and elevation 40 m. The connecting alignment should consist of a sag curve, constant grade section, and crest curve, and be designed for a speed of 80 km/h. What is the lowest grade possible for the constant grade section that will complete the alignment?

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