On a map with a scale of 1:7500000, the distance between A and B is 10 cm. A passenger car and a freight train leave from A and B at the same time and meet each other after 3 hours. It is known that the passenger car and the The ratio of truck speed is 3:2. When they met, how many kilometers away were they from the midpoint of A and B?
在一幅比例尺是1：7500000的地图上，量得甲、乙两地的距离是10厘米，一列客车和一列货车同时从甲、乙两地相向开出，3小时后相遇，已知客车和货车速度的比是3：2．相遇时，距离甲、乙两地的中点多少千米？
<gadget id="calculator">1 / 7_500_000</gadget>
<output>1/7_500_000 = around 0</output>

<gadget id="calculator">10 / (1/7_500_000) / 100_000</gadget>
<output>750</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">750 * (3/5)</gadget>
<output>450</output>

<gadget id="calculator">10 / (1/7_500_000) / 100_000 / 2</gadget>
<output>375</output>

<gadget id="calculator">450 - 375</gadget>
<output>75</output>

<result>75</result>