When Tristan visits Isolde on Valentine's Day, he's planning to bring her a one pound box of chocolates. He knows that when they share a one pound box of chocolates, it usually lasts for two weeks. When he eats a one pound box of chocolates on his own it lasts for six weeks. How long should a one pound box of chocolates last if Isolde eats it alone? Note: Assume they don't eat faster or slower when they are alone, Tristan eats alone for six weeks how much does Isolde eat, Tristan and Isolde are tow different people. thanks.