Corn Maze
Thanks  Farmer

Four cyclists, Alex, Bess, Carey and Delphine visit a corn maze. (See picture above) Starting at noon, each ride around a different path. Alex cycles at six km an hour. Bess rides at nine km an hour. Carey pedals at twelve km an hour. Delphine cycles at fifteen km an hour. The distance around each path is exactly one-third of a km. The four cyclists agree to ride four times around their respective path until they all meet at the center. Question : At what time do they finish their ride? See answer