Xiao Ding Ding and Xiao Pang went from school to the Children's Palace at the same time. Xiao Ding Ding walked 60 kilometers per minute, Xiao Pang walked 40 kilometers per minute, and Xiao Ding Ding walked from school to the Children's Palace for 7 minutes. When he arrived at the Children's Palace, he found that he forgot to bring something and returned immediately , I met Xiao Pang on the way back, and asked Xiao Pang to meet Xiao Ding Ding on the way after a few minutes from school.
小丁丁和小胖同时从学校到少年宫去，小丁丁每分钟走60千米，小胖每分钟走40千米，小丁丁从学校到少年宫走了7分钟，到少年宫发现忘带东西了立即返回，在返回途中碰到小胖，问小胖从学校出发经过几分钟和小丁丁在途中相遇．
<gadget id="calculator">60 * 7 * 2</gadget>
<output>840</output>

<gadget id="calculator">60 + 40</gadget>
<output>100</output>

<gadget id="calculator">840 / 100</gadget>
<output>42/5 = around 8.4</output>

<result>42/5 = around 8.4</result>