DK-GEORGMOHR 1999 Problem 4
Nanna and Sofie move in the same direction along two parallel paths, which are meters apart. Nanna's speed is meters per second, Sofie's only meter per second. A tall, cylindrical building with a diameter of meters is located in the middle between the two paths. Since the building first once the line of sight breaks between the girls, their distance between them is metres. How long will it be before the two girls see each other again?
Dataset text AI-MO AoPS. Quoted with source.
Official text: Georg Mohr Contest 1999 official paper, page 1.
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