Brookes Advertising, LLC, contracted with Leahs restaurant to fly an advertisement high above the Portland, OR. The advertisement offered $2,000 to any person who could swim from the Oregon side of the river to Washington and back across the Columbia River in less than six hours. Blake Thompson saw the streamer and accepted the challenge. He started his very long and cold swim that same day at 10 a.m. After he had been swimming for three hours and was about halfway done, Blake saw another plane pulling a streamer that read, Leahs restaurant revokes its previous offer. Is there a binding offer from Leahs? is there a proper contract formed between Blake and Leahs? If there is a contract, what kind of contract has been formed?