Stations A and B are 840 kilometers apart. Two trains leave opposite to each other and meet after 8 hours. The speed of car A is 52 kilometers per hour, what is the speed of car B?
A、B两站相距840千米，两列火车分别从两站相对开出，8小时后相遇．甲车的速度是每小时52千米，乙车的速度是多少？
<gadget id="calculator">840 / 8</gadget>
<output>105</output>

<gadget id="calculator">105 - 52</gadget>
<output>53</output>

<result>53</result>