3.17×15×2×2 =3.17×a0, =111.7(厘米); 3.17×11×2×27 =3.17×1a7, =2212.8a(厘米); 111.7:2212.8a=5:22; 答:一昼夜时针与分针尖端所走路程的比是5:22. 故答案为:5:22.