There are two trucks transporting a batch of steel materials together. Truck A transported half of them after 4 times. After truck A rested for a while, trucks A and B transported all the steel materials after using them 3 times together. If this batch of steel can only be transported by truck B, how many times will it take to transport it?
有两辆货车一起运一批钢材，甲货车运了4次就运了一半，甲车休息一会后，甲、乙两货车一起用了3次就运完了所有钢材．若这批钢材，只有乙货车来运，需要几次才能运完？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<result>24</result>