An international online math quiz starts at exactly 4:30 PM. The quiz lasts for 1 hour and 45 minutes.
At what time does the math quiz finish?

Answer: B. 6:15 PM

Let's break the time down to find when the quiz ends:
Start with the hours:
Adding 1 hour to 4:30 PM brings us to 5:30 PM.
Next, add the remaining 45 minutes:
Adding 30 minutes gets us to exactly 6:00 PM.
We still have 15 minutes left from our 45, so add those on.
Then we get 6:15 PM

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