Question 1034222
2400 kms/6 hrs= avg speed of 400 kph
2400 kms/4 hrs= avg speed of 600 kph
Difference of speeds is 200 mph; divided by 2 legs this equals 100 mph wind. So:
6(x-100)=4(x+100)
6x-600=4x+400
2x=1000
x=500
So, the plane flies at 500kph in still air!!!!!!!!