Skipping rope 600 times a day, 240 times in 2 minutes, according to this calculation, how many more minutes to complete the plan? (Solution by proportion)
每天跳绳600下，2分钟跳了240下，照这样计算，还要跳多少分钟能完成计划？(用比例解)
<gadget id="calculator">600 - 240</gadget>
<output>360</output>

<gadget id="calculator">240 / 2</gadget>
<output>120</output>

<gadget id="calculator">360 / 120</gadget>
<output>3</output>

<result>3</result>