The radius of the wheel of a bicycle is 40 cm. How many revolutions does the wheel make when the bicycle passes through a 1256-meter-long street?
一辆自行车的车轮半径是40厘米．这辆自行车通过一条1256米长的街道时，车轮要转多少周？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2 * 3.14 * (2/5)</gadget>
<output>2.512</output>

<gadget id="calculator">1_256 / 2.512</gadget>
<output>500</output>

<result>500</result>