An airplane is traveling at 390 km/hr in still air encounters a 65 km/hr headwind. how long will it take the plane to travel 725 km into the wind?

Respuesta :

The aircraft normally travels 390 kph, but with a head wind of 65 kph it would travel only 325 kph. 

725 km / 325 kph = 2.23 hours or about 2 hours and 14 mins.