Cars A and B are driving towards each other from two places 420 kilometers apart, and meet each other in 3 hours. It is known that car A travels 30 kilometers more than car B per hour. Find the speed of car A.
甲、乙两车分别从相距420千米的两地相向行驶，3小时相遇，已知甲车每小时比乙车多行驶30千米，求甲车的速度．
<gadget id="calculator">420 / 3</gadget>
<output>140</output>

<gadget id="calculator">140 + 30</gadget>
<output>170</output>

<gadget id="calculator">170 / 2</gadget>
<output>85</output>

<result>85</result>