The weights of 4 boxes are 20, 90, 40 and 60 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?
From her house Rimi went 20 km to the north. Then she turned west and covered 15 km. Then she turned south and covered 10 Km. Finally turning to east, she covered 15 km. In which direction is she from her house?