Liza, this is a rather complicated question and frankly, not a very productive one. Quite simply, no ship was in a position to render useful assistance to
Titanic, with the exception of
Californian. Even in her case, she could have done little, even working on a "best case scenario".
The chart drawn by Captain Knapp is inaccurate, because it's based on
Titanic's incorrect CQD position. All the distances and bearings of the various ships need small corrections. Having done that, we still have the same situation. Nobody could help.
The positions of the ships at the time they heard the CQD were necessarily a little rough. They were based on dead reckoning, which is always subject to errors. On some ships, limited celestial navigation was done and some had no precise fix for many hours, depending on their captains' practice.
I have a couple of positions handy.
Mount Temple was in 41.25N, 51.14W, more than 60 miles from
Titanic.
Captain Rostron placed
Carpathia in 41.10N, 49.12W. I've demonstrated elsewhere that this position is incorrect.
Carpathia was really about 8 miles further east and about 50 miles from
Titanic.
Other ships were much further away. Their approximate positions could be found, but they are academic. To rescue all or most of
Titanic's company she would have needed to have a ship the size of
Olympic or
Mauretania four or five miles astern. It would still have been a dicey affair.
Those who designed and operated
Titanic had expected that in the case of accident she would call for help on her radio. She would stay afloat until long after help arrived, as did
Republic in 1909. Their luck ran out.