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

Team Work on Road Construction

Five workers together can build a road in 20 days. Suppose every worker works at the same rate. If three workers work on the road for 10 days before eleven more workers join them, then how long total will it take to build the road?

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上期答案： Sunday

What Day Was Valentine's Day Last Year?

Valentine's Day (February 14th) of this year (2017) was Tuesday. What day was Valentine’s Day last year (February 14th, 2016)?

A. Monday
B. Sunday
C. Thursday
D. Tuesday
E. Friday
F. Saturday

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上 期 答 案 : 47.