The students of Hope Primary School lined up in two teams of equal numbers to go on a winter outing in the suburbs. The distance between each adjacent pair is (1/2) meter. It takes 60 meters to cross an 80-meter-long bridge at 40 meters per minute. minute. How many people are there in Hope Primary School?
希望小学的学生排着队两列人数相等的队伍去郊寒游，前后每相邻两人之间相距是(1/2)米，以每分钟40米通过一座长80米的大桥用了6分钟．希望小学有多少人？
<gadget id="calculator">40 * 6</gadget>
<output>240</output>

<gadget id="calculator">240 - 80</gadget>
<output>160</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">160 / (1/2)</gadget>
<output>320</output>

<gadget id="calculator">320 + 1</gadget>
<output>321</output>

<gadget id="calculator">321 * 2</gadget>
<output>642</output>

<result>642</result>