A man goes to a place on the car at a speed of 144 km/hr and comes back at a lower speed. If the average speed is 60 km/hr in total, then find his returning speed (in km/hr). 

1
40.05 km/hr 
2
37.89 km/hr 
3
33.33 km/hr 
4
22.25 km/hr 

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