Two pleasure boats set out from Grand Beach on Lynn Lake. After one hour, one boat is 10 km west and 6 km south of Grand Beach. The other boat is 5 km west and 8 km north of Grand Beach. How far apart are the two boats, to the nearest tenth of a kilometre?

Two pleasure boats set out from Grand Beach on Lynn Lake. After one hour, one boat is 10 km west and 6 km south of Grand Beach. The other boat is 5 km west and 8 km north of Grand Beach. How far apart are the two boats, to the nearest tenth of a kilometre?