Professor Fukano Details about the solution

Professor Fukanō stretches and puts on his favorite album.He'll be alone for a while.In the meantime, Orokana has been anxiously awaiting Fugōri's return,her plane fully refueled and ready to go.As soon as his plane touches the ground,she takes off, this time flying east.At this point, exactly 180 minutes have passed and the professor is at the halfway point of his journey with 90 kiloliters of fuel left.For the next 90 minutes,the professor and Orokana's planes fly towards each other,meeting at the three-quarter mark.Just as the professor's fuel is about the run out, he sees Orokana's plane.