It takes 6 times to transport a batch of goods, and it takes 6 times for vehicle A to transport them alone, and 3 times for vehicle B to transport them alone. If vehicles A and B are transported together, how many times can the goods be transported completely?
运一批货物，甲车单独运需要6次才能运完，乙车单独运需要3次才能运完，如果甲乙两车一起运，多少次能运完这批货物呢？
<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>