A and B start from two places AB at the same time and drive toward each other. A is 40km per hour, and B is 60km per hour. The two vehicles meet at a distance of 20km from the midpoint. How many kilometers are there between the two places?
甲乙分别从AB两地同时出发相向而行，甲每小时40km，乙每小时60km，两车在距中点20km处相遇，东西两地相距多少千米？
<gadget id="calculator">40 + 60</gadget>
<output>100</output>

<gadget id="calculator">60 - 40</gadget>
<output>20</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">20 * (1/10)</gadget>
<output>2</output>

<gadget id="calculator">100 * 2</gadget>
<output>200</output>

<result>200</result>