Two cars, passenger and freight, drive opposite each other from two places and meet each other in 2 hours. The ratio of the distance traveled by the passenger car and the truck when they meet is 2:5. The passenger car travels 40 kilometers per hour. How many kilometers per hour does the truck travel?
客货两车，从两地相对开出，2小时相遇，相遇时客车与货车所行路程的比是2：5，客车每小时行40千米，货车每小时行多少千米？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<result>100</result>