A truck delivers goods from place A to place B. It takes 5 hours to go there. When it comes back, the speed increases to 120 km/h. As a result, it returns to place A along the same road in 3 hours. This truck goes to place B to deliver goods How many kilometers per hour?
一辆货车从甲地往乙地送货，去时一共用了5小时，回来时速度提高到120千米/时，结果3小时就沿原路返回甲地，这辆货车去乙地送货时每小时行多少千米？
<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>