[微積] 應用題
題目如下：
A 100/3 -rpm stero record has a spiral groove starting 6 inches from
the center and ending 3 inches from the center. If it took 18 minutes
to play the record, approximately how long is the spiral groove?
其實我不太了解題目的意思，如果有高手可以解釋一下更好！
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