To transport a batch of goods, only small trucks are used to transport them, and it takes 6 times to transport them all. If it is only transported by a large truck, it can be transported in 3 times. If two vehicles are shipped together, how many times can the goods be shipped?
运送一批货物，只用小卡车运送，6次才能运完．若只用大卡车运送，3次就能运完．如果两辆车一起运，多少次能运完这批货物？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/6) + (1/3)</gadget>
<output>1/2 = around 0.5</output>

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

<result>2</result>