Jill screams and hears her echo 4.4 seconds later. How far from the canyon wall is she if the air temperature is 25 degree C?

Answer 1

2s=vt
s=vt/2=345•4.4/2=759 m

Answer 2

Vs= 331.5m/s + (0.6 * 25c) = 346.5m/s

D=Vsound * t/2

D= 346.5 m/s * 4.4sec/2 = 762.3 m