Question:
A housefly sits on the outer edge of a rotating circular ceiling fan with a diameter of 6 feet. The fan rotates constantly at a rate of 20 revolutions per minute. How many minutes had the housefly been on the fan during the time it took to travel $19{,}404\pi$ feet? Express your answer to the nearest whole number.

Answer:
A ceiling fan with a diameter of 6 feet has a circumference of $6\pi$ feet. If the fly traveled $19{,}404\pi$ feet, then it must have made $19{,}404\pi \div 6\pi = 3234$ revolutions. Since the fan rotates 20 times per minute, that's $3234 \div 20 = 161.7$ minutes, or about $\boxed{162\text{ minutes}}$, to the nearest whole number.