Two cars, A and B, drive from A to B respectively. A’s speed is B’s (4/5). A starts 4 minutes earlier than B, and A arrives 2 minutes later than B. How many minutes does it take for B to complete the journey? ．
甲、乙两车分别从A地开往B地，甲的速度是乙的(4/5)，甲比乙先出发4分钟，甲比乙晚到2分钟，那么乙行完全程共用多少分钟．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">16 + 8</gadget>
<output>24</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">24 / 1</gadget>
<output>24</output>

<result>24</result>