Final answer:
Additional information about Ivo's daily practice duration is required to calculate the number of days needed to reach 15 hours of practice. However, examples of adding units of time are provided demonstrating basic operations with time units.
Step-by-step explanation:
To determine how many days it will take for Ivo to practice a total of 15 hours, we need additional information about how long Ivo practices each day. Without that input, we cannot accurately calculate the number of days required. However, we can solve the unit of time addition problems given in the review section:
- 15 minutes + 60 minutes = 75 minutes
- 10 minutes + 20 minutes = 30 minutes
- 15 seconds + 45 seconds = 60 seconds or 1 minute
These calculations illustrate basic time addition in minutes and seconds and show how to combine units of time. Nonetheless, these examples do not provide the information necessary to solve Ivo's practice time question.