truck transports goods from A to B. It travels 40 kilometers per hour when it goes there. When it returns, it is empty (1/2) faster than when it went there. It takes 15 hours. What is the distance in kilometers between A and B?
一辆货车从甲地运送货物到乙地，去时每小时行40千米，返回时空车比去时快了(1/2)，结果一共用了15小时．在甲地到乙地之间的距离是多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 * (1/2)</gadget>
<output>20</output>

<gadget id="calculator">20 + 40</gadget>
<output>60</output>

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

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">15 * (2/5)</gadget>
<output>6</output>

<gadget id="calculator">60 * 6</gadget>
<output>360</output>

<result>360</result>