What is 10 minutes 15 seconds minus 5 minutes 50 seconds?

10 Min's - 5 Min's = 5 Min's - 50 Sec's = 4 Min's 10 Sec's - 15 Sec's = 3 Min's 55 Sec's

3 Minutes and 55 Seconds.

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Interesting math, but the correct answer is still 4 minutes, 25 seconds.

Why did you subtract the 15 seconds instead of adding it??