___is the way from your hometown?It's about 20km from here.(How long/How far)

问题描述:

___is the way from your hometown?It's about 20km from here.(How long/How far)
我认为是填写 How long,对么?

应是How far 意为 多远,指路程、距离
how long 意为多长,多久 一般指长度和时间后面有了the way 还是一样的么?how far 就是用来说明the way的呀