This app is a stopwatch + calculator. You input two speeds (1.lightspeed & 2.soundspeed by default) and then you can start the stopwatch. Under the stopwatch there will be a number that multiplies the time by ( 1 / ((1/speed2)-(1/speed1)) ) in real-time. This calculation allows you to find out how far away fireworks are by timing the difference between seeing the light of the firework and then hearing the sound.
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