好马每天走120千米，劣马每天走75千米，劣马先走12天，好马几天能追上劣马？4B4b:t4q8p
算式：提示9G2I,p8i8t7u(c9S)i1H4B4b:t4q8p
答：好马1|1g3N0{6S0D*X5d'f7D天能追上劣马。4B4b:t4q8p