's expressions and their equivalents

[Saneta]

Please tell me if sentence a) can I write also as a b):
1. a) It's about two hours's drive from my house to the airport.=
b) It's about a two-hour drive from my house to the airport.

2. a)I've got two weeks' holiday.=
b)I've got a two-week holiday.

3.a) It's twenty minutes' walk from my house to the centre.=
b)It's a twenty-minute walk from my house to the centre.

4.a)Last night I only had one hour's sleep.=
b) Last night I only had a one-hour sleep.

Are b) sentences written properly/correctly?

5. a) I met a friend of Jane's at the party.=
b)I met Jane's friend at the party or c)I met a Jane's friend at the party or d) I met the Jane's friend at the party?
Which is correct b) c) or d)?

Thanks a lot for help!!!

[Mister Micawber]

#1-4 are all OK. #5b is correct.
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Native English teacher at Mister Micawber's