Jack and Lee Walking Around a Circular Track 圆 周 散 步

Jack and Lee walk around a circular track. IttakesJackandLeerespectively6and10minutes to finish each lap. They start at the same time, at the same point on the track, and walk in the same direction around the track. After how many minutes will they be at the same spot again (not necessarily at the starting point) for the first time after they start walking?

(a) 15 (b) 16 (c) 30 (d) 32 (e) 60

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上 期 答 案： 15 天