The snail climbs up from the bottom of the 24 cm deep cup, and it takes 3 minutes to climb 6 cm. Then stop for 2 minutes and ask how long it takes for the snail to climb from the bottom of the cup to the mouth of the cup?
蜗牛从24厘米深的杯底往上爬，每爬6厘米要用3分钟．然后停2分钟，问蜗牛从杯底爬到杯口要用多少时间？
<gadget id="calculator">24 / 6</gadget>
<output>4</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">20 - 2</gadget>
<output>18</output>

<result>18</result>