Structure and Interpretation of 走得到吗？ In a dialogue of a certain Chinese text, after being told the location of the nearest post office, a lost international student asks,

"走得到吗？”

While I've found the meaning online to be something along the lines of "Is it within walking distance?", I'm struggling to parse how the sentence corresponds to that meaning.

Observing, 

1) 到 doesn't take the complement particle 得，as far as I'm aware.

2) 得到 most directly means "to obtain", and it doesn't seem like one could "go to obtain (a post office).

I'm not quite sure how to parse the words of this utterance onto their meanings in context.

This is A New China, an Intermediate Reader of Modern Chinese, chapter 4, for reference.

Thanks!
'走'(to walk) is the verb 

'到'(arrive/ to) in '走到'(to walk to) is the resultative verb particle

Resultative verb particle completes the verb action. in this case- you walk to/ you walk and arrive. 

'得'(able to) in '走得到' is the potential particle 

There are only two potential particles. They are 得(can) and 不(cannot). You are either potentially can or cannot walk there.

'吗' in '走得到吗？' is the final interrogative particle (indicates the phrase is a question)


  "走得到吗？" means "can (I) walk to (that place)?"