It takes 6 hours for the express train to go from station A to station B, and 10 hours for the slow train to travel from station B to station A. The two cars are traveling towards each other from the two stations at the same time. When they meet, the express train has traveled 225km.
快车从甲站开往乙站需要6小时，慢车从乙站开往甲站需要10小时，两车同时从两站相向而行，相遇时快车行了225km，两站相距多少千米．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

<gadget id="calculator">(1/6) + (1/10)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">1 / (4/15)</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">(1/6) * (15/4)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">225 / (5/8)</gadget>
<output>360</output>

<result>360</result>