A large truck and a bus depart from places A and B at the same time. The truck travels 35 kilometers per hour, and the bus travels 40 kilometers per hour. After 4 hours, the two vehicles meet. How many kilometers is the distance between A and B?
大货车和客车同时从甲、乙两地相对开出，大货车每小时行35千米，客车每小时行40千米，4小时后两车相遇，求甲、乙两地相距多少千米？
<gadget id="calculator">35 + 40</gadget>
<output>75</output>

<gadget id="calculator">75 * 4</gadget>
<output>300</output>

<result>300</result>