An object cover first third of its journey with 30m/s second third of its journey with 40m/sand last third with 60m/s find the average speed during entire journey

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A man drive his car to the office at 20miles/hr. 
After reaching office, he realize that its a new year holiday so he went back home at a speed of 30miles/hr. 

Discounting the time spent in the stoppage what was his average speed of his journey ?

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