9. Vremyankin and Puteykin simultaneously set out from Utrenneye to Vechernoye. The first of them walked half of the time spent on the journey at a speed of $5 \mathrm{km} / \mathrm{h}$, and then at a speed of $4 \mathrm{km} /$ h. The second, however, walked the first half of the distance at a speed of 4 km/h, and then at a speed of 5 km/h. Who arrived in Vechernoye earlier?
9. Vremyankin walked half of the time at a speed of 5 km/h, therefore, walking at this speed, he covered more than half of the distance, while Puteykin, walking at this speed, only covered half of the distance, which is why Vremyankin arrived at the final destination earlier than Puteykin.