A bus and a truck are traveling towards each other from places A and B respectively. The speed of the bus is 90 km/h and the speed of the truck is 75 km/h. After 3 hours, the distance between the two cars is still 30 km. The distance between places A and B is How many kilometers?
客车和货车分别从甲、乙两地相向而行，客车速度是90千米/时，货车速度是75千米/时，经过3小时后两车还相距30千米，甲、乙两地相距多少千米？
<gadget id="calculator">90 + 75</gadget>
<output>165</output>

<gadget id="calculator">165 * 3</gadget>
<output>495</output>

<gadget id="calculator">495 + 30</gadget>
<output>525</output>

<result>525</result>