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2 times in 60 seconds how many seconds went by before the manatee surface the first time if it held its breath for the same rate

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Apocrophon

It took a breath every 30 seconds.
Assuming that the breath instantly gives enough air, and then the manatee goes right back under, then the manatee goes under every;
\(\frac{60sec}{2\ breaths}=\frac{30 sec}{breath}\)
Thus, the manatee holds its breath for 30 seconds.

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