Two trains A and B depart from two places 500 kilometers apart at the same time. Train A travels 80 kilometers per hour. After 2 hours, the distance between the two trains is still the full distance (2/5). How many kilometers does train B travel per hour? ?
甲乙两列火车从相距500千米的两地同时相对开出，甲车每小时行80千米，2小时后两车还相距全程的(2/5)，乙车每小时行了多少千米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) / 2</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">500 * (3/10)</gadget>
<output>150</output>

<gadget id="calculator">150 - 80</gadget>
<output>70</output>

<result>70</result>