A bus travels two-fifth of the distance at a speed of 50 km/h and the remaining distance at a speed of 60 km/h. What is the average speed of the bus for the whole journey?
1
57\(\frac{2}{9}\) km/h
2
54\(\frac{7}{9}\) km/h
3
55\(\frac{5}{9}\) km/h
4
56\(\frac{8}{9}\) km/h