Final answer:
Time can be added or subtracted by carefully converting minutes into hours, or seconds into minutes and hours. The examples provided demonstrate the correct subtraction of time units, the conversion of seconds into minutes and hours, and the addition of time intervals as it pertains to planning an itinerary, as shown by Maria's activities.
Step-by-step explanation:
Understanding Time Calculations
When working with time, it is important to understand how to both add and subtract units of time. Here are some examples based on the question:
- 35 minutes - 10 minutes = 25 minutes
- 60 minutes - 10 minutes = 50 minutes
- 1 hour 75 minutes - 20 minutes can be simplified by converting 75 minutes into 1 hour 15 minutes, then subtracting 20 minutes, resulting in 2 hours 55 minutes
- 2 hours 10 minutes - 20 minutes = 1 hour 50 minutes
- 1 hour 5 seconds - 5 minutes requires converting 5 minutes into 300 seconds before subtracting from the 1 hour 5 seconds, resulting in 1 hour minus 295 seconds
For converting units and fractional units of time, we have:
- 3000 seconds equals 50 minutes (since 3000 divided by 60 equals 50)
- 6000 seconds equals 1.6667 hours (since 6000 divided by 3600 equals 1.6667)
- 360 minutes equals 6 hours (since 360 divided by 60 equals 6)
Maria's situation in Figure 2.1.11.1 requires adding different time intervals:
1 hr 25 min + 20 min + 15 min = 1 hr 60 min, which simplifies to 2 hours. Therefore, she should arrive at her friend's house by 3:00 pm.
The concept of the Date Line and Universal Time (UT) explains why crossing 180 degrees takes us to a different day, illustrating how time zones work.