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Mathematics 7 Online
OpenStudy (anonymous):

A, B, C are three towns forming a triangle. A man has to walk from one town to the next town, then ride to the next, and then again drive towards his starting point. He can walk, ride, and drive a km in a, b, c minutes respectively. If he starts from B, he takes a + c -b hours, if he starts from C, he takes b + a -c hours, and if he starts from A, he takes c + b -a hours. Find the length of the circuit. [A] 60a [B] 50a [C] 40a [D] 65a

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