兔从圆心以速度u 直线往岸边划,耗时 t1 = r/u
狼以速度3.2u 绕岸追,顶多追半周圆,耗时 t2 = (3.14*r)/(3.2u)
很明显,t2
兔从圆心以速度u 直线往岸边划,耗时 t1 = r/u
狼以速度3.2u 绕岸追,顶多追半周圆,耗时 t2 = (3.14*r)/(3.2u)
很明显,t2
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