Question 858699
The rate against the wind is : 5,000/5 = 1,000 miph 
The rate with the wind is : 12,420/9 = 1,380 miph

The rate of the wind : 1,380 - 1,000 = 380 miph
The rate of the jet in still aif : 1,000 miph

Though I'm not sure dude x_x