Station A and Station B are 600 kilometers apart. Two trains leave at the same time and travel toward each other. After 4 hours of meeting, it is known that the passenger train travels 80 kilometers per hour, and how many kilometers per hour does the truck travel? (equation solution)
甲、乙两站相距600千米，两列火车同时开出，相向而行，经过4小时相遇，已知客车每小时行80千米，货车每小时行多少千米？(方程解)
<gadget id="calculator">80 * 4</gadget>
<output>320</output>

<gadget id="calculator">600 - 320</gadget>
<output>280</output>

<gadget id="calculator">280 / 4</gadget>
<output>70</output>

<result>70</result>