No. The riddle has multiple solutions, all viable under the common and also the inverted (inner concave) spherical globe model.
That's one answer. There are more.
Mach 2 Boom: Illegal Leak + Influencing Election
Btw Concorde flew with 5.5 degrees nose up at Mach 2 60,000 ft to maintain altitude above concave (not flat) Earth surface.
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