Please look at this question for me A and B are 1550 meters apart. Now a starts from a and B at the same time. A's speed is 75 m / min, B's speed is 65 m / min, and C starts from B at the same time, the speed is 85 m / min? Please ask the next floor, why is the distance between Party A and Party B 70t? This problem, like everyone else, I calculated 8.61, but the answer given by the child's teacher was 10, so I couldn't think of the solution.

Please look at this question for me A and B are 1550 meters apart. Now a starts from a and B at the same time. A's speed is 75 m / min, B's speed is 65 m / min, and C starts from B at the same time, the speed is 85 m / min? Please ask the next floor, why is the distance between Party A and Party B 70t? This problem, like everyone else, I calculated 8.61, but the answer given by the child's teacher was 10, so I couldn't think of the solution.

Don't blindly believe the teacher. If it's 10 minutes, you can calculate that a and B walked (750 + 650) * 2 = 1400, with a difference of 150 meters. At this time, C walked 10 * 85 = 850, 200 meters more than B. multiplying by 2 is 400 meters. Obviously, it's far from 150, which is wrong