题干

小明跑操场一圈要8分钟,妈妈跑一圈12分钟.如果小明和妈妈同时起跑,至少多少分钟后两人在起点再次相遇?此时小明、妈妈分别跑了多少圈?

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答案(点此获取答案解析)

解:8=2×2×2,

12=2×2×3,

8、12的最小公倍数是2×2×2×3=24,所以至少24分钟后两人在起点再次相遇.

相遇时小明跑了:24÷8=3(圈),

妈妈跑了:24÷12=2(圈).

答:至少24分钟两人在起点再次相遇,相遇时妈妈跑了3圈,小明跑了2圈.

 

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