115. One hundred apples are lying in a row, one meter apart from each other. The gardener picked up the first apple, placed a basket in its place, and threw the apple into it. What distance will the gardener travel if he carries the remaining 99 apples to the basket one by one?
115. To carry an apple to the basket, one needs to travel the path from the basket to the apple and back to the basket. Therefore, the entire required path will be equal to $2(1+2+3+\ldots+99)=$ $=99 \cdot 100=9$ km 900 m.