A travels at a speed of 30 kilometers per hour, and B travels at a speed of 20 kilometers per hour. A and B start from A to B at the same time. They arrive at B one after another and then return to A. This round-trip movement has already Knowing that the point where A and B meet for the second time is 45 kilometers away from the point where A catches up with B for the second time, how many kilometers is the distance between A and B?
A的速度为每小时行30千米，B的速度为每小时行20千米，A和B同时从甲地出发到乙地，他们先后到乙地后要返回甲地，如此往返运动，已知A与B第二次一面相遇的点与A第二次追上B的点相距45千米，甲乙两地相距多少千米？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 4</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">2 - (8/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">45 / (2/5)</gadget>
<output>225/2 = around 112.5</output>

<result>225/2 = around 112.5</result>