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... ir own examination papers, they quickly counted with frowns.
Pierce didn't dare to delay, and turned to the first question.
【A and B are walking towards each other from two places at the same time. After four hours, they meet at a distance of 5 kilometers from the center point. It is known that A is faster than B. How many kilometers is A faster than B in an hour? 】
Pierce frowned all of a sudden. This should be an Olympiad problem, seeking an unknown number, but the c ...
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