The diameter of a bicycle wheel is about 5 decimeters. If the wheel rotates 100 times per minute, how many meters does the bicycle travel in one minute?
一种自行车车轮的直径大约是5分米，如果车轮每分钟转100圈，自行车一分钟走过的路程是多少米？
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.14 * (1/2) * 100</gadget>
<output>157</output>

<result>157</result>