The distance between A and B is 540 kilometers. Two cars start from the two places at the same time and meet each other for 6 hours. One car travels 50 kilometers per hour, and the other car travels how many kilometers per hour.
甲乙两地相距540千米，两车分别从两地同时出发，相向而行6小时相遇，一车每小时行50千米，另一车每小时行多少千米．
<gadget id="calculator">540 / 6</gadget>
<output>90</output>

<gadget id="calculator">90 - 50</gadget>
<output>40</output>

<result>40</result>