Two trains A and B leave at the same time from opposite sides 495 meters apart, and meet after 4.5 hours. Train A travels 64 kilometers per hour. Find the speed of train B.
甲、乙两列火车同时从相距495米的两相对开出，4.5小时后相遇，甲火车每小时行64千米，求乙火车的速度．
<gadget id="calculator">495 / 4.5</gadget>
<output>110</output>

<gadget id="calculator">110 - 64</gadget>
<output>46</output>

<result>46</result>