The distance between A and B is 900 km. It takes 15 hours for car A to go from point A to point B, and it takes 10 hours for car B to go from point B to point A. When the two cars leave from the two places at the same time, how many kilometers did car A travel when they meet?
A、B两地相距900千米．甲车由A地到B地需15小时，乙车由B地到A地需10小时，两车同时从两地相对开出，相遇时甲车行了多少千米．
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/15) + (1/10)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / (1/6)</gadget>
<output>6</output>

<gadget id="calculator">6 * (1/15)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">900 * (2/5)</gadget>
<output>360</output>

<result>360</result>