Two people, A and B, ride towards each other from two places. A's speed is 20 km/h, and B's speed is 18 km/h. When they meet, they are 1.5 km away from the midpoint. How many kilometers are the distance between the two places? ?
甲乙两人分别从两地骑车相向而行，甲的速度为20千米/时，乙的速度为18千米/时，两人相遇时距离中点1.5千米，两地相距多少千米？
<gadget id="calculator">20 + 18</gadget>
<output>38</output>

<gadget id="calculator">20 - 18</gadget>
<output>2</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1.5 * 1</gadget>
<output>1.5</output>

<gadget id="calculator">38 * 1.5</gadget>
<output>57</output>

<result>57</result>