Consideration

Has lunch already been eaten at the time when Mike said 'you must pay because I have given you the benefit of my company' or was this said before they sat at the table? 'Mike promised to take John to lunch,' - at the time of that promise did I say to JOhn 'and I shall pay' or did I simply promise to take him for lunch? If I had promised to take him to the car ferry, does that mean that I have to get on the ferry as well? I have already fulfilled my obligation by taking him to the restaurant at lunch time If he chooses to eat, that's his problem If I choose to eat and I have no money, that's my problem. But I can still run faster than he can You may now appreciate the difficulty in writing examination questions that are totally complete and non-ambiguous!