3) A plane has 2.5 hours in which to make a round trip from Erehwon, California to Sperduto, Nevada- which lies 1000 km due east of Erehwon - and back. (Assume that when the plane reaches Sperduto it makes an instant turn-around!) There is a constant wind speed of 300 km/hr towards the east. If the plane is to fly at a constant speed v relative to the air, what should that speed be