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如图,一只狗与一只兔同时从环形跑道的★处出发,并按同方向沿直径为100米的圆周运动,如果狗的速度为450米/分,兔子的
As shown in the picture, a dog and a rabbit start at the same time from the ★ of the circular track and move in the same direction along a circle with a diameter of 100 meters. If the speed of the dog is 450 meters/minute, the rabbit’s