Xiaogang originally planned to ride a bicycle from point A to point B at a speed of 15 kilometers per hour, so that he could arrive at the specified time, but he delayed the original planned departure time by 30 minutes due to some accidents, so he had to travel at 18 kilometers per hour. He advances at a speed of 1,000 kilometers and arrives at point B 10 minutes later than the stipulated time. If he wants to arrive on time, what should his speed be adjusted to?
小刚原计划骑自行车以15千米/小时的速度由A地到B地，这样便可以在规定的时间到达，但他因事将原计划出发的时间推迟了30分钟，只好以每小时18千米的速度前进，结果比规定的时间晚10分钟到达B地，如果要按时到达，他的速度应调整为多少？
<gadget id="calculator">30 - 10</gadget>
<output>20</output>

<gadget id="calculator">20 / 60</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">18 - 15</gadget>
<output>3</output>

<gadget id="calculator">(1/3) / 3</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">18 * (1/9)</gadget>
<output>2</output>

<gadget id="calculator">30 / 60</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 - (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(1/3) / 3 / (3/2)</gadget>
<output>2/27 = around 0.074074</output>

<gadget id="calculator">15 * 18 * (2/27)</gadget>
<output>20</output>

<result>20</result>