Wind drift

The plane flies at 900 km/h, passing distance 1800 kilometers with the wind and once again against the wind for 4 h 1 min. What is the wind speed?

Correct result:

v =  46 km/h

Solution:

t1+t2=4+160 (900+v)t1=1800 (900−v)t2=1800  v=46 km/h 

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