Professor Fukano has embarked on a new challenge

Professor Fukanō, the famous eccentric scientist and adventurer,has embarked on a new challenge:flying around the world nonstop in a plane of his own design.Able to travel consistently at the incredible speed of one degree longitude around the equator per minute,the plane would take six hours to circle the world.There's just one problem:the plane can only hold 180 kiloliters of fuel,only enough for exactly half the journey.Let's be honest.The professor probably could have designed the plane to hold more fuel,but where's the fun in that?