Two planes A and B fly towards each other from two airports 750 kilometers apart at the same time, and arrive at the same midway airport after flying for half an hour. If the speed of plane A is 1.5 times that of plane B, what is the speed of plane B?
甲、乙两架飞机同时从相距750千米的两个机场相向飞行，飞了半小时到达同一中途机场，如果甲飞机的速度是乙飞机的1.5倍，求乙飞机的速度？
<gadget id="calculator">750 / 0.5</gadget>
<output>1_500</output>

<gadget id="calculator">1.5 + 1</gadget>
<output>2.5</output>

<gadget id="calculator">1 / 2.5</gadget>
<output>0.4</output>

<gadget id="calculator">1_500 * 0.4</gadget>
<output>600</output>

<result>600</result>