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【单选题】
甲乙两人在一条椭圆形田径跑道上练习快跑和慢跑，甲的速度为3米／秒，乙的速度为7米／秒，他们在同一点同向跑步，经过100秒第一次相遇，若他们反向跑，多少秒后第一次相遇?（ ）
A.
30
B.
40
C.
50
D.
70
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