A bus has to travel from A to B. The bus covers the first one-third of the distance at 25 km/h and the next one-fourth of the distance at 30 km/h. For the rest of the journey, the bus travels at 50 km/h. The average speed of the bus (in km/h) for the entire journey is ______.
1
33
2
\(37 \frac{1}{2}\)
3
4
35