Banana states: I need help setting this problem up: A person fires a rifle horizontally. The bullet has a muzzel speed of 200 m/s, and the person hears the bullet strike the target 1 second after firing. The air temp is 72 degrees Farenheit. What is the distance of the target? (I know to convert to 22.2 degrees C, and I then found the speed of sound at this temp. I got 344.3 m/s. But where does the bullet's velocity come in? I don't think this is a Doppler effect problem, because we didn't get to that section yet.) Can anyone get me started in the right direction?