A class starts at 8:40 AM and ends at 1:10 PM with a 30-minute break. Find the actual teaching time.
Explanation
To find the actual teaching time, we need to subtract the break time from the total time. The class starts at 8:40 AM and ends at 1:10 PM, so the total time is 1:10 PM - 8:40 AM = 4 hours 30 minutes. The break time is 30 minutes, so we subtract this from the total time to get 4 hours 30 minutes - 30 minutes = 4 hours.
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