Wind drift

The plane flies at 860 km/h, passing distance 3000 kilometers with the wind and once again against the wind for 6 h 59 min. What is the wind speed?

Correct result:

v =  31 km/h


t1+t2=6+5960 (860+v)t1=3000 (860v)t2=3000  v=31 km/h 

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