A helicopter flies 168 miles against the wind in 2 hours; with the wind, it can fly 252 miles in the same time.

Question

I need to find the speed of the helicopter in still air.

Answer 1

d=rt

168=(r-w)*2

252=(r+w)*2

simplify

84=r-w

126=r+w

add

210=2r

r=210/2

r=105 miles per hour is the speed of the helicopter in still air

the rate of the wind is 21 mph