Find against the wind, an airplane travels 1400 km in five hours. Flying with the wind, the same plane travels 11,160 km in nine hours. What is the rate of the plane in still air and what is the rate of the wind?

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same