To convert the starfish's speed from centimeters per minute to centimeters per second, you can use the conversion factor that there are 60 seconds in a minute.
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Start with the speed in centimeters per minute: \[ 161 \text{ cm/min} \]
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Convert to centimeters per second by dividing by 60: \[ \frac{161 \text{ cm/min}}{60 \text{ seconds/min}} \approx 2.6833 \text{ cm/s} \]
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Round to the nearest centimeter per second: \[ 2.6833 \text{ cm/s} \text{ rounds to } 3 \text{ cm/s.} \]
So, the speed of the starfish to the nearest centimeter per second is 3 centimeters per second.