The speed ratio of cars A and B is 4:7. The two cars start from opposite places at the same time and meet at a distance of 30 kilometers from the end point. How many kilometers are the distance between the two places?
甲乙两车的速度比是4：7，两车同时从两地相对出发，在距终点30千米处相遇，两地相距多少千米？
<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">4 + 7</gadget>
<output>11</output>

<gadget id="calculator">7 / 11</gadget>
<output>7/11 = around 0.636364</output>

<gadget id="calculator">4 / 11</gadget>
<output>4/11 = around 0.363636</output>

<gadget id="calculator">(7/11) - (4/11)</gadget>
<output>3/11 = around 0.272727</output>

<gadget id="calculator">60 / (3/11)</gadget>
<output>220</output>

<result>220</result>