The diameter of the wheel of a small bicycle is 40 centimeters. Calculated at 100 revolutions per minute, how many minutes does it take to pass a 6.28-kilometer bridge?
一种小自行车的车轮外胎直径是40厘米，按每分转100圈计算，通过一座6.28千米的大桥，需要多少分钟？
<gadget id="calculator">6.28 * 1_000</gadget>
<output>6_280</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3.14 * (2/5) * 100</gadget>
<output>125.6</output>

<gadget id="calculator">6_280 / 125.6</gadget>
<output>50</output>

<result>50</result>