There is a distance of 80 kilometers between the upper and lower ports of a certain river. Passenger ships A and B with equal speeds sail towards each other at regular intervals every day. Ship A travels 12 kilometers per hour along the current, and ship B travels 8 kilometers per hour against the current. One day, when boat A was setting out, something dropped from the boat, and the object drifted down the river. When two boats, A and B, met, how far was the object from the meeting point?
某河上下两港相距80千米，每天定时有甲乙艘船速相等的客轮从两港相向而行，甲船顺水而行每小时行12千米，乙船逆水每小时行8千米．这天甲船在出发时，从船上掉下一物，此物顺水漂流而下，当甲乙两船相遇时，此物距相遇地点有多远？
<gadget id="calculator">12 + 8</gadget>
<output>20</output>

<gadget id="calculator">80 / 20</gadget>
<output>4</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">48 - 8</gadget>
<output>40</output>

<result>40</result>