Sophie Zabar, clairvoyants, cried out in pain at precisely the instant her twin brother, 500 km away, hit his thumb with a hammer. A skeptical scientist observed both events (brother's accident, Sophie's cry) from an airplane traveling at 12/13 to the right (see Fig. 12.19). Which event occurred first, according to the scientist? How much earlier was it, in seconds?

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Brother 500 km 12 13 Sophie