Answer :
Final answer:
Isaac and Sultana spent a total of 40 hours and 10 minutes building the model robot, which differs from the provided options. The time spent over 12 days was 33 hours and on the last day, it was 7 hours and 10 minutes, leading to the total calculated time.Therefore, the correct answer is option (c) 117 hours and 10 minutes.
Explanation:
To calculate the total amount of time Isaac and Sultana spent building a model robot, we first determine the daily time spent over 12 days and then add the time spent on the last day.
Their daily building session was from 4:30 PM to 7:15 PM, which is a duration of 2 hours and 45 minutes. Over the course of 12 days, this adds up to:
- 2 hours/day × 12 days = 24 hours
- 45 minutes/day × 12 days = 540 minutes
Now, convert 540 minutes to hours and minutes:
- 540 minutes = 9 hours (since 1 hour = 60 minutes)
Total time for the first 12 days is 24 hours + 9 hours = 33 hours.
On the last day, they built for 7 hours and 10 minutes. Adding this to the total from the first 12 days:
- 33 hours + 7 hours = 40 hours
- 0 minutes + 10 minutes = 10 minutes
The total amount of time they spent building the model robot is 40 hours and 10 minutes.
Option (c) 117 hours and 10 minutes is not possible since it exceeds the time calculated above. The correct answer is likely a typo because none of the provided choices match the accurate calculation.