Weight of Sona is four times that of Mona. Weight of Mona is 2.5 times of Hona. Weight of Hona is 1.5 times of Dhona. Weight of Dhona is 2.5 times of Rona. Who is the heaviest?
Preetam cycles 6 km towards the south direction. He turns right to move 8 km, and again turns towards the north-east to move 10 km. From there, he moves 15 km on the left. How far is he from his original position?