If a car travels from A to B at a speed of 12 kilometers per hour, it will arrive 3 hours early; if it travels at 10 kilometers per hour, it will arrive 2 hours late. How many kilometers is the distance between A and B?
一辆汽车从甲地到乙地，若以每小时12千米的速度，则提前3小时到达；若每小时10千米的速度，则迟到2小时，甲地和乙地相距多少千米？
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">36 + 20</gadget>
<output>56</output>

<gadget id="calculator">12 - 10</gadget>
<output>2</output>

<gadget id="calculator">56 / 2</gadget>
<output>28</output>

<gadget id="calculator">28 + 2</gadget>
<output>30</output>

<gadget id="calculator">10 * 30</gadget>
<output>300</output>

<result>300</result>