A hair stylist takes 1 hour, 15 minutes, for one appointment, and 2 hours, 45 minutes, for the next appointment. How long, in hours, did the two appointments take?

Add the appointment times: 1 hour 15 minutes + 2 hours 45 minutes. The minutes total 60 minutes, which is 1 hour, so the appointments took 1 + 2 + 1 = 4 hours altogether. The correct choice is 4.

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