Quantitative Aptitude Speed Time and Distance Average Speed

During a journey a person travels half of the distance at a speed of 18 km/h and the remaining half of the journey at a speed of 22 km/h. What is his average speed for the entire journey? 

1
21.4 km/h
2
20.2 km/h
3
19.2 km/h
4
19.8 km/h

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