From Chongqing to Chengdu, a passenger car travels 70 kilometers per hour and departs from Chongqing, and a truck travels 55 kilometers per hour and departs from Chengdu, traveling towards each other. They are still 20 kilometers apart at 3 o'clock. How many kilometers is it from Chongqing to Chengdu?
从重庆到成都，一辆客车每小时行70千米从重庆出发，一辆货车每小时行55千米从成都出发，相向而行．它们经过3时还相距20千米，重庆到成都多少千米？
<gadget id="calculator">70 + 55</gadget>
<output>125</output>

<gadget id="calculator">125 * 3</gadget>
<output>375</output>

<gadget id="calculator">375 + 20</gadget>
<output>395</output>

<result>395</result>