Two cars, B, are traveling towards each other from two places at the same time. Car A travels 72 kilometers per hour, and car B travels 64 kilometers per hour. When the two cars meet, they are 20 kilometers away from the midpoint of the journey. How many kilometers is the distance between the two places?
乙两车同时分别从两地相向而行．甲车每小时行72千米，乙车每小时行64千米．两车相遇时距全程的中点20千米．两地之间相距多少千米？
<gadget id="calculator">72 - 64</gadget>
<output>8</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">72 + 64</gadget>
<output>136</output>

<gadget id="calculator">20 * (1/4) * 136</gadget>
<output>680</output>

<result>680</result>