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Petra always keeps the 66 bedrooms in her house clean. It takes her 1515 minutes to clean a single rooms. How many hours will it take her to clean all 66 bedrooms?

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Q. Petra always keeps the 66 bedrooms in her house clean. It takes her 1515 minutes to clean a single rooms. How many hours will it take her to clean all 66 bedrooms?
  1. Calculate total cleaning time: Calculate the total cleaning time for all rooms.\newlinePetra takes 1515 minutes to clean one room. For 66 rooms:\newline15 minutes/room×6 rooms=90 minutes.15 \text{ minutes/room} \times 6 \text{ rooms} = 90 \text{ minutes}.
  2. Convert to hours: Convert the total cleaning time from minutes to hours.\newlineThere are 6060 minutes in an hour, so:\newline9090 minutes ÷\div 6060 minutes/hour = 1.51.5 hours.

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