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yes the wind (head or tail) is 175km/h
what you have to take into account is the direction of flight.
this is how i did it:
going: distance = 4200km ; Net speed = plane speed + tail wind (it is pushing the plane forward) ; time = 3 hrs
coming: distance = 4200km ; Net speed = plane speed - head wind (it is pushing the plane backwards) ; time = 4hrs
from this stems 2 equations
4200 = 3 (plane+tail)
4200 = 4 (plane -wind)
solving these equations you get plane speed to be 1225km/h and wind speed to be 175km/h
so that means the net speed going was 1400km/h and the net speed coming was 1050km/h, however, the plane is still going at 1225km/h.
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