Why would you want to put those 2 values into your stationary f value? Wouldn't you want to include those values for the changed f-values? Also couldn't you say that the speed of sound is just 334?
Homework Statement
Hearing the siren of an approaching fire truck, you pull over to the side of the road and stop. As the truck approaches, you hear a tone of 470 Hz; as the truck recedes, you hear a tone of 400 Hz. How much time will it take the truck to get to the fire 2.5 km away assuming...