Practice: Two trains are running towards each other at the same time from places A and B, which are 540 kilometers apart, and meet after 3.6 hours. It is known that the passenger car travels 80 kilometers per hour, how many kilometers per hour does the truck travel?
练一练：两列火车同时从相距540千米的甲乙两地相向而行，经过3.6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？
<gadget id="calculator">540 / 3.6</gadget>
<output>150</output>

<gadget id="calculator">150 - 80</gadget>
<output>70</output>

<result>70</result>