A test started at 9.30 am and ended at 2.15 pm. How long did the test last?
The test lasted for 4 hours and 45 minutes.
To find out how long the test lasted, we need to calculate the difference between the starting time (9.30 am) and the ending time (2.15 pm).
Step 1: Convert the starting time to the 24-hour format:
9.30 am = 09:30
Step 2: Convert the ending time to the 24-hour format:
2.15 pm = 14:15
Step 3: Calculate the time difference:
14:15 - 09:30 = 4 hours and 45 minutes
Therefore, the test lasted for 4 hours and 45 minutes.
To find out how long the test lasted, you can subtract the start time from the end time.
First, let's convert the start time to minutes. 9:30 am is equal to 9 hours and 30 minutes. Since each hour is 60 minutes, 9 hours is 540 minutes. Therefore, the start time is 540 + 30 = 570 minutes.
Next, convert the end time to minutes. 2:15 pm is equal to 2 hours and 15 minutes. Adding the hours and converting to minutes, we get 2 hours = 120 minutes + 15 minutes = 135 minutes.
Now, subtract the start time from the end time:
135 minutes - 570 minutes = -435 minutes.
Since the result is negative, it means that the end time is on the previous day.
To find the positive duration, add 24 hours (1440 minutes) to the negative result:
-435 minutes + 1440 minutes = 1005 minutes.
Therefore, the test lasted for 1005 minutes.