Two trains A and B depart from opposite places at the same time. After 5 hours of meeting, the two trains run at the original speed again, and after another 4 hours, train A arrives at the destination. It is known that A travels 10 kilometers more per hour than B, how many kilometers is the distance between the two places?
甲、乙两列火车同时分别从两地相对开出，经过5小时相遇后两车又按原来的速度行驶，又经过4小时甲车到达目的地．已知甲每小时比乙多行10千米，求两地相距多少千米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 / (1/5)</gadget>
<output>50</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">50 * 9</gadget>
<output>450</output>

<result>450</result>