Alright, so using context clues is a crucial part of expanding vocabulary (and, frankly, passing the PSAT and SAT). Basically, a good place to start is to find a word that could replace the one in quotation marks and sound like it means the same.
In this case, as you read, you notice that the phrase "tangible factors" seems to be synonymous with "physical facilities". A big giveaway is the word "another" before "tangible" which proves that the word before it is indeed equal (or similar) in meaning.
Take for a moment, then, that:
physical facilities = tangible factors
Facilities and factors are both nouns, so we'll pass over them for a moment.
physical ≈ tangible
This is how you can use context clue. And, if you look up the definition of tangible, you'll see it means something like "able to be perceived or touched", which is pretty close to "physical". (But, without using a dictionary, you can still infer that the word "intangible" is equivalent to the opposite of "physical". Write your sentence with that in mind.)