How do you solve the following problem: You are in charge of keeping the drinks cold for a picnic. You have a styrofoam box that is filled with cola, water and you plan to put some 0° ice in it. Your task is to buy enough ice to put in the box at 6am so that the temperature stays at 0°C until the picnic starts at 4pm. You don't want to buy too much ice because that means that you'll have less money to spend on food and other picnic items. How much ice will you need? You have 90 ''minutes'' to calculate the amount of ice, before your cousin picks you up to drive to buy the ice. Getting information from the resources (on left-hand panel) may cost you some 'time'. The resources will only cost you '' time'' when you first access them and the cost will be always indicated. Your score will depend partially on how much 'time' you have left in your account.