The nearest métro is Pernety, requiring at least two line changes for those arriving from CDG.
I suggest you take a taxi at approximately 50€.
Another options is the AF Bus to Montparnasse, 16.50€ then either taxi or métro to your hotel. If you have 2-3 people, the taxi is probably a cheaper option unless you walk to your hotel from Montparnasse.
If we got the RER from CDG to Denfert/Rocherceau,
1/ how far is the walk to the hotel
2/ How long would it take.
3/ How much would a taxi be
You can easily find answers to your questions with a couple of online tools:
Type in the name of your hotel then zoom in a little. The metro stations will show as a white circle with the letter "M" in the middle... or "RER" for RER stations. Have a look in the left margin and you'll see Google also provides walking directions.
For taxis, the http://taxig7.com site has a fare calculator. If you need instructions to use it in English try here:
Add to the above... type in your hotel name followed by > ,Paris <
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