There are two water tanks. Tank A has 84 liters of water, which is 60 liters less than tank B. The water in tank B flows to tank A at 2 liters per minute. After a few minutes, the water in both tanks will be the same?
有两个水缸，甲缸有水84升，比乙缸少60升，乙缸的水每分钟流向甲缸2升，几分钟后两个水缸的水一样多？
<gadget id="calculator">60 - 84</gadget>
<output>-24</output>

<gadget id="calculator">84 + (-24)</gadget>
<output>60</output>

<gadget id="calculator">2 + 2</gadget>
<output>4</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<result>15</result>