The express train and the slow train depart from two cities that are 600 kilometers apart at the same time, and they meet on the way in 5 hours. It is known that the speed ratio of the express train to the slow train is 3:2. How many kilometers does the express train travel per hour?
快车和慢车同时从相距600千米的两城相对开出，5小时在途中相遇，已知快车与慢车的速度比是3：2，快车每小时行驶多少千米？
<gadget id="calculator">600 / 5</gadget>
<output>120</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">120 * (3/5)</gadget>
<output>72</output>

<result>72</result>