Two balls, A and B, roll from a point along the circumference of a circular orbit at a constant speed and meet each other every 40 minutes. The speed of A is 5 times that of B. How long does it take for ball A to roll for one circle?
甲乙两球从问一地点沿环形轨道周长匀速滚动，每隔40分钟相遇一次，甲的速度是乙的速度的5倍，求甲球滚动一周需要多长时间？
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