A. The distance between city B and city a is 50 kilometers. City a starts from city a by bike to city B. one hour and 30 minutes later, city B starts from city a by motorcycle to city B. It is known that the speed of city a is 2.5 times that of city B, and city B arrives one hour earlier than city A. what are the speeds of city a and city B?

Let a's velocity be x, then B's velocity is 2.5x. Then calculate by time. 50 △ 2.5x + 1.5 + 1 = 50 △ x, then x = 1.2, then a's velocity is 1.2km/h, B's velocity is 3km / h

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