A sprinter ran 3 times back and forth on a straight track, and ran a total of 300 meters. How long is this straight track?
短跑选手在一段直跑道上跑了3个来回，共跑了300米，这段直跑道有多长？
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">300 / 6</gadget>
<output>50</output>

<result>50</result>