a bus went 318 km farther than a car.the car went one third as far as the bus.
问题描述：
a bus went 318 km farther than a car.the car went one third as far as the bus.
答
意思是 公交车比小汽车多行驶318千米
小汽车所行驶的路程是汽车路程的三分之一
one third 是三分之一的意思
分数表达法：基数词做分子,序数词做分母
简单来说是子基母序