Flying against the wind, an airplane travels 4400km in 8 hours. Flying with the wind,the same plane travels 7650 km in 9 hours.

Question

Rate of the plane in still air

 

rate of the wind

Answer 1

Donte,

 

Let s be the speed of plane in still air in km/hr

Also let w be the wind speed in km/hr

 

When against the wind s-w = 4400/8

When with the wind s+w = 7650/9

 

Adding the 2 equations 2s = 4400/8 + 7650/9

2S = 550 + 850 = 1400; s = 700 km/hr