What is the rate of the plane in still air? What is the rate of the wind?

Question

Flying against the wind, an airplane travels 4140 kilometers in 6 hours. Flying with the wind, the same plane travels 7210 kilometers in 7 hours.

Answer 1

against the wind p -w = 4140/6= 690

p +w = 7210/7= 1030

p = plane's speed in still air = 860 mph

w = wind's speed = 170 mph

860 +170 = 1030

860 -170 = 690