Two trains, A and B, depart from two places 500 kilometers apart at the same time. After 4 hours, they do not meet and the distance is still 10%. It is known that train A travels 65 kilometers per hour. How many kilometers per hour does train B travel?
甲乙两列火车同时从相距500千米的两地相对开出，4小时后没有相遇还相距10%，已知甲车每小时行65千米，乙车每小时行多少千米？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">500 * (1/10)</gadget>
<output>50</output>

<gadget id="calculator">500 - 50</gadget>
<output>450</output>

<gadget id="calculator">450 / 4</gadget>
<output>225/2 = around 112.5</output>

<gadget id="calculator">(225/2) - 65</gadget>
<output>95/2 = around 47.5</output>

<result>95/2 = around 47.5</result>