How many minutes are there in a day?

A day consists of 24 hours, and each hour contains 60 minutes. To determine the total number of minutes in a day, you multiply the number of hours by the number of minutes per hour:

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

Therefore, the correct answer reflects that there are 1,440 minutes in a day. This understanding is essential for various calculations and planning within the water treatment field, where accurate time management is crucial for operations and maintenance. The other values presented in the options do not represent the correct multiplication of hours and minutes, illustrating common misconceptions regarding time conversions.