SHARYGIN 2005 Problem 21
The planet Tetraincognito covered by ocean has the shape of a regular tetrahedron with an edge of km. What area of the ocean will the tsunami' cover hours after the earthquake with the epicenter in a) the center of the face, b) the middle of the edge, if the tsunami propagation speed is km / h?
Dataset text AI-MO AoPS. Quoted with source.
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