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Tonight's piano concert is so memorable that it is broadcast on several local radio stations so it can be heard throughout the city. Alberto is sitting one of the last rows of the auditorium and has more than 20 rows ahead but does not seem worried since they have assured him that the acoustics of the place are excellent.
Benito, on the other hand, has preferred to listen to the concert from his home and has his ear attached to his FM transistor waiting for the concert to begin.
Who will listen before the first note of the concert?
Since the propagation velocity of radio waves is greater than the propagation velocity of sound, we can deduce that Benito will hear Alberto's first concert note before Alberto.