Use a bamboo pole to measure the oil depth of the oil depot, first insert one end of the bamboo pole vertically into the oil, mark the oil mark with mark A on the bamboo pole, then insert the other end of the bamboo pole vertically into the oil, and mark it with mark B on the bamboo pole According to the oil marks, the distance between the two marks is 30 cm, which is 1/10 the length of the bamboo pole. Find the oil depth.
用一根竹竿测量油库的油深，先把竹竿的一头垂直插入油中，在竹竿上用记号A记住油痕，再把竹竿的另一头垂直插入油中，也在竹竿上用记号B记住油痕，已知两记号的距离是30厘米，是竹竿长的(1/10)，求油深．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">30 / (1/10)</gadget>
<output>300</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(11/10) / 2</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">300 * (11/20)</gadget>
<output>165</output>

<result>165</result>