1. On Tuesday, September 10, John delivered a written offer to sell a house to Mary. Theoffer stated that "This offer is to be left over until Thursday, 10 o'clock, September 12."On Wednesday, John sold the house to Jill. Lance found out about the sale to Jill and toldMary.At 8 a.m. Thursday, Lance acting as the agent of Mary, handed John a letter ofacceptance.John had also posted an offer to sell his car to Ken . On the 1st September, John posted arevocation of his offer. The offer from John was received by Ken on the 4th Septemberand a letter of acceptance was sent the same day. On the 10th September, John's letter ofrevocation reached Ken.Both Mary and Ken are contemplating suing John and John has come to you for advice.Advise John.