In the orchestra
In the school orchestra four musicians play – one the violin, one the clarinet, one the cello, and one the trumpet. During a performance not always all four play at once. Sometimes only one instrument plays, sometimes two, sometimes three, and sometimes all four. For the opening of the school year they invented a performance in which first each played alone as a soloist, then all pairs, all triples, and finally all four together. All groupings played for exactly one minute. How long did their performance last?
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