紧急求救

monicamomo

fuel of the first 2 mile is 15 dollars. And the rest cost at a fixed price. Ask the cost of 14 miles.
(1) 3.5 miles cost 20 dollars
(2) x (specific number) miles cost 40 dollars.

请问答案为什么是B,不是D?条件1不是能推出来吗?

linlin315

同意答案是D

henry_shao

我也认为是D，除非X<2。