For a batch of goods, it takes 9 times to complete the transportation by vehicle A alone, and 6 times to complete the transportation by vehicle B alone. Now, this batch of goods is transported by vehicle A three times first, and the rest of the goods are transported by vehicle B. How many more times does vehicle B need to transport to complete?
一批货物，甲车单独运送需9次完成，乙车单独运送需6次完成．现在，这批货物先由甲车运送3次，余下的货物由乙车来运，乙车还需运几次可以完成？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/9) * 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/3) / (1/6)</gadget>
<output>4</output>

<result>4</result>