Its the third sentence,because a plural word hast to have a dash, not a space/
Answer: Three days
Explanation: The journey would take three days considering fair weather.
In a sentence, there is always a Subject and a Predicate. A subject is the main topic of a sentence, while the predicate is what the subject is pertained to. In the sentence: Relaxing is not as easy as it looks. The subject is Relaxing which is also considered a gerund. And the predicate is 'is not as easy as it looks'.
Answer:
I think it would be unconquerable