A post-man starts cycling from his post office. He cycles 7 km South, then turns West and cycles 5 km, Then turns North and cycles 6 km, then turns to his right and cycles 5 km. Where is he now with reference to his post office?
The weights of 4 boxes are 80, 60, 90 and 70 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes?