Flying against the wind, an airplane travels 2040 km in 4 hours. flying with the wind, the same plane travels 4650 km in 5 hours. what is the rate of the plane in still air and what in the rate of the wind? tl;dr (the answer is plane in still air 720 km/h and rate of the wind is 210 km/h) i just need help setting this up please it's using elimination and substitution please help