She falls out of a plane 2 miles up, equipped with a parachute as well as a backup parachute, they both fail. how much time does it take for her to hit the surface?

D=Vot+1/2at^2

Vot= 0 since there is no initial velocity in the y direction.

a=gravitational acceleration which is - 32 ft/s^2 in imperial units I believe.

She travels a distance of -2 miles, so

-2 miles= 1/2(-32ft/s^2)t^2

t=square root((- 4 miles)/(-32ft/s^2))

I don't know imperial units, but convert miles to feet then solve for t.