The truck travels 80 kilometers per hour and the car travels 100 kilometers per hour. Two cars leave from places A and B at the same time, and the distance between them is still 30 kilometers after 4 hours. How many kilometers are the distance between places A and B?
小货车每小时行驶80千米，小轿车每小时行驶100千米．两车从甲、乙两地同时相对开出，4小时后还相距30千米，甲、乙两地相距多少千米？
<gadget id="calculator">80 + 100</gadget>
<output>180</output>

<gadget id="calculator">180 * 4</gadget>
<output>720</output>

<gadget id="calculator">720 + 30</gadget>
<output>750</output>

<result>750</result>