On a map with a scale of 1:7500000, the distance between the two places is 10 cm. A passenger train and a freight train depart from opposite places at the same time and meet each other in 3 hours. It is known that the speed ratio of the passenger car and the truck is 3:2, how many kilometers does the truck travel per hour?
在一幅比例尺是1：7500000的地图上，量行两地距离是10厘米．一列客车和一列货车同时从两地相对开出，3小时相遇．已知客车和货车的速度比是3：2，货车每小时行多少千米？
<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 / 3</gadget>
<output>250</output>

<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">250 * (2/5)</gadget>
<output>100</output>

<result>100</result>