Xiao Tao and Xiao Jun practice running. Xiao Tao runs 8 meters per second, and Xiao Jun runs 6 meters per second. The two are heading in the same direction from the same place. Xiaojun runs for 30 seconds first. How many seconds will it take for Xiaotao to catch up with Xiaojun? (column equation solution)
小涛和小军两人练习跑步，小涛每秒跑8米，小军每秒跑6米．两人从同一地点向同一方向前进，小军先跑30秒，多少秒后小涛追上小军？(列方程解答)
<gadget id="calculator">30 * 6</gadget>
<output>180</output>

<gadget id="calculator">8 - 6</gadget>
<output>2</output>

<gadget id="calculator">180 / 2</gadget>
<output>90</output>

<result>90</result>