Are the boats on opposite tacks?
See the definitions of Tack, Leeward and Windward.
Which boat, if either one, is obliged to keep clear?
See Rule 10
Have the boats kept clear at the final point in the illustration?
See the definition of Keep Clear.
If a give way boat is not keeping clear, what obligation, if any, does the right of way boat have?
See Rule 14 and Rule 43.