Xiao Ming ran back and forth 50 times along the 80-meter runway, how many meters did he run in total?
小明沿着80米的跑道来回跑了50次，他一共跑了多少米．
<gadget id="calculator">80 * 2 * 50</gadget>
<output>8_000</output>

<result>8_000</result>