There are two types of trucks. Large trucks can hold 1.2 tons each time, which is 1.5 times that of small trucks. A batch of stones is transported by a large truck, and the freight for each truck is 420 yuan, and the freight of a small truck is 38 yuan cheaper than that of a large truck. (Ask questions by yourself and solve equations in parallel)
有两种型号的卡车，大卡车每次能装1.2吨，是小卡车的1.5倍．一批石子，用大卡车运，每车的运费是420元，小卡车的运费比大卡车便宜38元．(自己提出问题，并列方程解答)
<gadget id="calculator">420 - 38</gadget>
<output>382</output>

<result>382</result>