Xiaotao goes to school by bicycle and needs to cross a bridge with a length of 1256 meters. It is known that the outer wheel of his bicycle has a diameter of 0.8 meters and an average of 100 revolutions per minute. How many minutes does it take him to cross this bridge?
小涛骑自行车去上学，要通过一座长1256米的桥，已知他的自行车外轮直径是0.8米，平均每分钟转100周，他通过这座桥需要多少分钟？
<gadget id="calculator">3.14 * 0.8 * 100</gadget>
<output>251.2</output>

<gadget id="calculator">1_256 / 251.2</gadget>
<output>5</output>

<result>5</result>