snail crawls about 1.5 centimeters per minute, and the depth of a dry well is 2.1 meters. How long does it take for the snail to climb from the bottom of the well to the mouth of the well?
一只蜗牛每分钟大约爬行1.5厘米，一口枯井深是2.1米．这只蜗牛要多长时间才能从井底爬到井口？
<gadget id="calculator">2.1 * 100</gadget>
<output>210</output>

<gadget id="calculator">210 / 1.5</gadget>
<output>140</output>

<result>140</result>