In support of #19 and against #17, it is as if you were standing in the street and someone asked "Do you know what the time is/Do you know where Leicester Square is?". This is, as with OP, is a yes or no answer in the literal sense but in the widely accepted conventions of covnersation the answer is "Twenty past eight/Through Picadilly Circus, past the Trocadero, over Wardour Street, past the building which is where the Swiss Centre used to be and you are there. By the way it is pronounced Lester". And if you are going to be as literal as that the answer can also be maybe, possibly, very likely, I would have thought so etc etc.
Stick tongue out emoticon thing.