The side length of a square playground is 10 meters. Hong Hong runs 3 laps along the playground. How many meters does Hong Hong run?
一个正方形操场边长是10米，红红沿操场跑3圈，红红跑了多少米．
<gadget id="calculator">10 * 4 * 3</gadget>
<output>120</output>

<result>120</result>