Which sentence uses the wrong how-phrase for the requested measurement? The speaker wants physical distance in kilometres, not travel time.
How long is it from the station to the warehouse?✓الإجابة الصحيحة
How far is it from the station to the warehouse?
How far away is the warehouse from the station?
How many kilometres is the warehouse from the station?
الشرح
Distance is requested with how far, so using how long points instead toward duration or length. The other options all ask for the relevant distance measurement.