An airplane flies against the wind from A to B in 8 hours. The same airplane returns from B to A, in the same direction as the wind, in 7 hours. Find the ratio of the speed of the airplane (in still air) to the speed of the wind. Choose the correct choice from the following
A) 15  B) 25  C) 35  D) 45  E) 55
Let x = speed of airplane in still air, y = speed of wind and D the distance between A and B. Find the ratio x / y   15gainst the wind: D = 8(x - y), with the wind: D = 7(x + y)   8x - 8y = 7x + 7y, hence x / y = 15   correct answer is 15) 15
<result>A</result>
An airplane flies against the wind from A to B in 8 hours. The same airplane returns from B to A, in the same direction as the wind, in 7 hours. Find the ratio of the speed of the airplane (in still air) to the speed of the wind.