Question 1033583
Let h = speed of helicopter in still air, and w = speed of the wind.

Use the formula D = R*T.

From the first sentence, we get 328 = 2(h-w), and from the second sentence, we get 

492 = 2(h+w).

==> 164 = h-w,  and 246 = h+w, after simplification.

==> 410 = 2h, after adding corresponding sides of the two previous equations.

==> h = 205 miles per hour, the speed of the helicopter in still air.

Again other tutors are welcome to elaborate more on the solution if they wish so.