A and B leave each other from two places 360 km away. It is known that the speed of a is 60 km / h and that of B is 40 km / h. If a leaves for one hour first, how long will it take for B to meet each other?
Let B drive for X hours and the two cars meet. From the meaning of the question, we get 60 (x + 1) + 40x = 360. The solution is: x = 3. A: the two cars meet three hours after B drives,
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