Final answer:
Joe's walking time is unknown, so we cannot determine which days he walked to school in less than 1/2 hour.
Step-by-step explanation:
To determine which days Joe walked to school in less than 1/2 hour, we need to compare the time taken on each day to the given time frame. Let's go through the options:
- a) Monday, Wednesday: We don't have any information about Joe's walking time on these days, so we cannot determine if he walked to school in less than 1/2 hour on these days.
- b) Tuesday, Thursday: If Joe walked to school in less than 1/2 hour on these days, these would be the correct answer. However, we don't have any specific data to confirm this.
- c) Friday, Saturday: Similarly, we don't have any information about Joe's walking time on these days, so we cannot determine if he walked to school in less than 1/2 hour on these days.
- d) Sunday: Again, we lack specific information about Joe's walking time on this day, so we cannot say for certain if he walked to school in less than 1/2 hour on Sunday.
In conclusion, we don't have enough data to determine which specific days Joe walked to school in less than 1/2 hour.