351 students from Yingcai Primary School visited the Science and Technology Museum and walked in a file with a distance of 0.6 meters between the front and back. The team moved at a speed of 50 meters per minute. A teacher needs to return from the head of the line to the end immediately, and his speed is 100 meters per minute, so how many minutes does it take him to go from the head of the line to the end of the line?
英才小学的351名同学去科技馆参观，排成一列纵队步行，前后两人相距0.6米，队伍以每分钟50米的速度行进．一位老师有事要从排头立即返回排尾，他的速度是每分钟走100米，那么他从队伍的排头走到排尾一共要用多少分钟？
<gadget id="calculator">351 - 1</gadget>
<output>350</output>

<gadget id="calculator">350 * 0.6</gadget>
<output>210</output>

<gadget id="calculator">100 + 50</gadget>
<output>150</output>

<gadget id="calculator">210 / 150</gadget>
<output>7/5 = around 1.4</output>

<result>7/5 = around 1.4</result>