How many minutes are there in a day?

To determine the number of minutes in a day, consider that there are 24 hours in a day, and each hour is composed of 60 minutes. Therefore, the total number of minutes in a day can be calculated by multiplying the number of hours by the number of minutes per hour:

24 hours/day × 60 minutes/hour = 1,440 minutes/day.

This calculation confirms that there are 1,440 minutes in one day, making it the correct answer. Knowing this basic conversion is essential, as it is a fundamental aspect of time management and calculations that often come up in various contexts, including wastewater treatment processes where time-based measurements are crucial.