A snail climbs vertically from the bottom of a cup 15 cm high. It takes 3 minutes to climb 3 cm and then rests for 2 minutes. How long does it take to reach the mouth of the cup?
一只蜗牛从15厘米高的杯子底部竖直往上爬，它每爬3厘米要用3分钟，然后休息2分钟，它爬到杯口要用多长时间？
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

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

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">25 - 2</gadget>
<output>23</output>

<result>23</result>