A certain school conducts field military training, and teams A and B set off from the school at the same time. The walking speed of the two teams during the day is different. Team A walks 20 kilometers in each day, and team B walks 15 kilometers. The walking speed of the two teams at night is the same. As a result, team A takes exactly 5 days and nights to reach the destination, while team B The team took exactly 6 days and nights to reach the destination. So, how many kilometers are there from the school to the destination?
某校进行野外军训，甲、乙两队同时从学校出发．两队白天的行走速度是不同的，甲队每个白天行20千米，乙队行15千米，夜里两队的行走速度是相同的，结果甲队恰好用5个昼夜达目的地，乙队恰好用6个昼夜到达目的地．那么，从学校到目的地共有多少千米？
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<gadget id="calculator">100 - 90</gadget>
<output>10</output>

<gadget id="calculator">10 + 20</gadget>
<output>30</output>

<gadget id="calculator">30 * 5</gadget>
<output>150</output>

<result>150</result>