A and B set out at the same time from a and B which are 180 km apart. A rides a bicycle and B rides a motorcycle. They travel at a constant speed along the same route. It is known that a's speed is 15 km / h and B's speed is 45 km / h. how long does it take for them to meet each other?
Let two people meet after X hours. From the meaning of the question: 15x + 45x = 180, the solution is: x = 3
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