It's going to rain, Lingling sees lightning in the distance, and hears thunder 2 seconds later. How far is the place of lightning from Lingling? (Thunder travels 340 meters per second in the air)
要下雨了，玲玲看见远处有闪电，2秒后听到雷声．闪电的地方离玲玲有多远？(雷声在空气中每秒传播340米)
<gadget id="calculator">340 * 2</gadget>
<output>680</output>

<result>680</result>