On Monday, Ruth sent an email to Raymond offering to sell Dark Caviar (her very fast race-horse) for $3 million. As Dark Caviar is not cheap, Raymond replied (in another email) that he needed some time to think about it and organise a syndicate. Ruth, replied back "don't worry - let me know by Sunday 6.00 pm. I'll keep it open until then."

On Friday, Ruth sold Dark Caviar to Bart, a retired trainer and sent an email to Raymond informing him that Dark Caviar had been sold. However, Raymond does not check his email during the weekends.

On Sunday morning, Raymond finally organises a syndicate to stump up the $3 million, and in a state of great excitement, calls Ruth and, before she can get a word in, accepts her offer in these words "Ruth, I accept - assuming we can agree on a delivery date". Ruth then informs him that she has sold Dark Caviar to Bart.

Raymond is shocked. He drives straight to your office and asks if she can do that?

What the advise can be given to Raymond? What do you think, indicate whether?

-Ruth's promise that she would keep her offer open until Sunday at 6.00 pm is enforceable

-Ruth's revocation by email or over the phone is effective,

-Assuming the offer is open on Sunday, indicate whether Raymond's purported acceptance is valid