The distance between A and B is 480 kilometers. Passenger cars and trucks depart opposite from each other at the same time and go towards each other. After 4 hours, the two cars were still 80 kilometers apart. It is known that the truck travels 53 kilometers per hour, how many kilometers per hour does the passenger car travel?
甲乙两地相距480千米．客车和货车同时从两地相对开出，相向而行．4小时后，两车还相距80千米．已知货车每小时行53千米，问客车每小时行多少千米？
<gadget id="calculator">480 - 80</gadget>
<output>400</output>

<gadget id="calculator">400 / 4</gadget>
<output>100</output>

<gadget id="calculator">100 - 53</gadget>
<output>47</output>

<result>47</result>