A bus covers a distance of 120 km at a speed of 60 km/hr and next 150 km at a speed of 75 km/hr. At what speed should the bus travel for the remaining distance to complete its journey of 350 km in 5 hours?
1
60 km/hr.
2
70 km/hr.
3
80 km/hr.
4
90 km/hr.