Run a 200m race on a 400m circular track. The width of each runway is 1.5 meters. The starting line of the athletes in the second track is how many meters ahead of the starting line in the first track.
在400米的环形跑道上进行200米跑步比赛．每个跑道的宽度是1.5米．第2道的运动员的起跑线要比第一道的起跑线提前多少米．
<gadget id="calculator">3.14 / 2</gadget>
<output>1.57</output>

<gadget id="calculator">1.5 * 2 * 1.57</gadget>
<output>4.71</output>

<result>4.71</result>