From place A to place B, go down the mountain first and then walk on a flat road. A person rides a racing car from place A down the mountain at a speed of 24 kilometers per hour, then passes through the flat road at a speed of 18 kilometers per hour, and it takes 55 minutes to reach place B. ; When returning, pass the flat road at a speed of 16 kilometers per hour, and then go up the mountain at a speed of 8 kilometers per hour. It takes 1 (1/2) hour to return to place A. Find the distance between places A and B.
从甲地到乙地，先下山后走平路，某人骑赛车从甲地以每小时24千米的速度下山后，以每小时18千米的速度通过平路，到乙地共用55分钟；返回时以每小时16千米的速度通过平路，再以每小时8千米的速度上山，回到甲地共用1(1/2)小时，求甲、乙两地之间的距离．
<gadget id="calculator">12 + 6</gadget>
<output>18</output>

<result>18</result>