The weights of 4 boxes are 20, 40, 60 and 90 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes and in a combination a box can be used only once?
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?