The two cars drove oppositely from the east and west stations at the same time, and met for the first time at a place 45 kilometers away from the east station. Meet at 9 kilometers on the side. How many kilometers are the distance between the two cars.
两辆汽车同时从东西两站相对开出，第一次在离东站45千米的地方相遇，之后两车继续以原来的速度前进，各自到站后都立即返回，又在距中点东侧9千米处相遇．两车相距多少千米．
<gadget id="calculator">45 * 3</gadget>
<output>135</output>

<gadget id="calculator">135 - 9</gadget>
<output>126</output>

<gadget id="calculator">126 / 1.5</gadget>
<output>84</output>

<result>84</result>