1. I was able to up to 100 push-ups with my palms on the floor.
2. I could do up to 100 push-up with my fists on the floor.
[Are the sentences grammatical?]
3. Excuse me. Is Green Park far from here?
- Yes, it's very far.
[In the last sentence, what does 'it' refer to? Does 'it' refer to 'Green Park'? Or does 'it' refer to 'distance' as an impersonal pronoun?]
"I was able to up to 100..." makes no sense. The second sense does: "I was able to do..."
"it" refers to the park, not the distance.