The speed of car A is (7/8) the speed of car B. The two cars are traveling towards each other from AB at the same time and meet at a distance of 4 kilometers from the midpoint. What is the distance in kilometers between the two places?
甲车的速度是乙车速度的(7/8)，两车从AB两地同时相向而行，在距离中点4千米处相遇，两地的距离是多少千米．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 7</gadget>
<output>15</output>

<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">(8/15) - (7/15)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">8 / (1/15)</gadget>
<output>120</output>

<result>120</result>