Victor is on a volcanic island. He needs to get back to his ship before the volcano explodes, but he would also like to get the buried treasure marked on his treasure map (shown below) along the way.

How much shorter would it be for Victor to go straight back to his ship than for him to get the buried treasure along the way?

Round your final answer to the nearest tenth of a kilometer. Do not round intermediate calculations.

(Coordinate values are in kilometers)