A and B are traveling from A to B. The distance between A and B is 180 kilometers. A starts one hour later than B, but still arrives 30 minutes before B. The speed ratio of A and B is 3:2. What is the speed of B? ?
甲、乙两车从A地到B地，A、B相距180千米，甲比乙晚出发一小时，但仍比乙先到30分钟，甲乙速度比为3：2，求乙速为多少？
<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">1.5 / 1</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 * 3</gadget>
<output>4.5</output>

<gadget id="calculator">180 / 4.5</gadget>
<output>40</output>

<result>40</result>