Cars A and B meet at point O after 6 hours under normal circumstances, if car B maintains a normal speed. Car A travels 10 kilometers more per hour than normal, and the meeting point is 20 kilometers away from point O. If. Car B travels 6 kilometers longer than normal. Car A travels 4 kilometers per hour more than normal. Then the meeting point is 10 kilometers away from point O. So how many kilometers are there between A and B?
甲，乙两车，正常情况下6小时后相遇在O点相遇，如果乙车保持正常速度．甲车比正常每小时多行10千米，则相遇地点距离O点20千米，如果．乙车比正常多行6千米．甲车比正常每小时多行4千米．则相遇地点距离O点10千米．那么A，B相距多少千米？
<gadget id="calculator">20 + 10</gadget>
<output>30</output>

<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<gadget id="calculator">20 / 1</gadget>
<output>20</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">50 - 20</gadget>
<output>30</output>

<gadget id="calculator">30 / 1</gadget>
<output>30</output>

<gadget id="calculator">20 + 30</gadget>
<output>50</output>

<gadget id="calculator">50 * 6</gadget>
<output>300</output>

<result>300</result>