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A from a, B from B at the same time with uniform speed, the first encounter a 6 km, continue to move forward, arrive at each other's starting point, immediately return, at 3 km away from B, the second encounter, a and B are () km away A. 10B. 12C. 18D. 15
6 × 3-3 = 18-3, = 15 (km), that is, the distance between a and B is 15 km
A from a, B from B at the same time with uniform speed, the first encounter a 6 km, continue to move forward, arrive at each other's starting point, immediately return, at 3 km away from B, the second encounter, a and B are () km away
A. 10B. 12C. 18D. 15
6 × 3-3 = 18-3, = 15 (km), that is, the distance between a and B is 15 km
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