Xiao Minghua and his father stood in Tiananmen Square, watching the fireworks for the closing ceremony of the 29th Olympic Games. Xiao Ming heard the sound of fireworks 3 seconds after seeing the fireworks. Estimate how many kilometers away from Xiao Ming the place where the fireworks were set off. (The speed of sound in air is 340 m/s)
小明化和爸爸站在天安门广场，观看第29届奥运会闭幕式烟火，小明看到烟花3秒后才听到烟花声，估计一下，放烟花的地方离小明有多少千米．(声音在空气中的传播速度是340米/秒)
<gadget id="calculator">3 / 1_000</gadget>
<output>3/1_000 = around 0.003</output>

<gadget id="calculator">340 * (3/1_000)</gadget>
<output>51/50 = around 1.02</output>

<result>51/50 = around 1.02</result>