A swimming pool is 120 meters long, and Xiao Ming can swim back and forth twice each time. How many meters does he swim each time?
一个游泳池长120米，小明每次能游两个来回．他每次游多少米？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">120 * 4</gadget>
<output>480</output>

<result>480</result>