Question: Three friends-whose walking rates are 1 ft./sec., 3ft./sec.,and 6ft./sec. start together walking in the same direction around a circular track that is 420 feet in circumference.After how many minutes are the three of them together again?\nOptions:\n(A) 5 mins\n(B) 10 mins\n(C) 15 mins\n(D) 3 mins\n(E) 7 mins Let's think first. Some random reasoning:
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The time they take will be what the 1st friend takes to complete one circumference as he is the slowest and that is the point all 3 of them will be together at the end of 7 mins. The final answer: (E).
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