Directions: Study the information carefully and answer the given questions.

Rehan participated in a marathon. He started at the starting line and started running towards the South, upon reaching 10 km, he made a left turn and ran another 6 km before taking another left turn. He then ran 8 km and turned towards his right. After running for 4 km, he turned left and reached the finish line after another 2 km. How far away is the finish line from the starting line? (All turns are 90° turns only.)