A hiker travels at 4km/h4\text{km/h}4km/h for 222 hours and 6km/h6\text{km/h}6km/h for 333 hours. What is the average speed?
5.2km/h5.2\text{km/h}5.2km/h
5km/h5\text{km/h}5km/h
4.8km/h4.8\text{km/h}4.8km/h
5.5km/h5.5\text{km/h}5.5km/h