Cars A and B drive from two places 588 meters apart at the same time. When the distance between the two cars is 210 kilometers, it takes exactly 4 hours. It is known that the speed of car B is 45 kilometers per hour. Find the speed of car A.
甲乙两车同时从相距588米的两地同时相对开出，当两车相距210千米时，正好用了4小时，已知乙车速度为45千米每小时，求甲车的速度．
<gadget id="calculator">45 * 4</gadget>
<output>180</output>

<gadget id="calculator">588 - 210 - 180</gadget>
<output>198</output>

<gadget id="calculator">198 / 4</gadget>
<output>99/2 = around 49.5</output>

<result>99/2 = around 49.5</result>