Since this really isn't that important, well except for anal retentive nitpickers, in the end I took Jerry's approximation from Altgens to Jackie's door/Kennedy's head to be about 30 feet so I divided his overall measurement into 3 pieces and hence the overall proportional distance is about 18-19 feet. If you really want to figure it out exactly to an inch then be my guest and forever more you can be the hero of this insignificant factoid. 
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JohnM
Thanks, Mr Fallacious Arguments
So, when asked a simple question, you go full ad hominem " anal retentive nitpickers", and then go to the absurd, " exactly to an inch" , and then try to minimize, " insignificant factoid".
Yet, you never get around to answering the question.
Did you factor in the width of the street?
If so, please show your work.
Thx.