By air, the distance from Helsinki to Copenhagen is about [[$ 1200 $]] km. The plane leaves Helsinki at 7.00 am [[$ 600 $]] km / h towards Copenhagen. An aircraft flying to Helsinki from Copenhagen leaves half an hour later and is flying at [[$ 450 $]] km / h.

Solve by drawing how far from Helsinki the planes meet and what time it is.



Answer: The planes meet km from Helsinki at .