The distance between A and B is 450km. Two cars leave from A and B at the same time and meet each other after 3 hours. The speed ratio of the express train and the slow train is 3:2. How many kilometers does the express train travel per hour?
甲、乙两城相距450km，两辆汽车同时从甲、乙两城相对开出，3小时后相遇，已知快车和慢车的速度比是3：2．快车每小时行多少千米？
<gadget id="calculator">450 / 3</gadget>
<output>150</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">150 * (3/5)</gadget>
<output>90</output>

<result>90</result>