I don't like the second. I'd say:
It's five hours' drive from here.
I think the article is wrong here.
Yep. I agree. But I wouldn't use the silly apostrophe after hours.
Many purists prefer it. I think it is on its way out, though.
This is clearly a possessive, so the apostrophe should be there.
It shouldn't have the apostrophe in this example because of the article. Without 'a', I'd agree with you.;-)
It gives sense and sounds better.
I think the second one seems to be the right one. However, the apostrophe is not necessary.
You're wrong Lidier; it's the first one. Secondly, if the article was not there, which would make the second right, the apostrophe would still be required.
i am so intelligant every one says ..x hopefully im right