Two trains, A and B, depart from two places 480 kilometers apart at the same time. Train A travels 80 kilometers per hour. After 2 hours, the distance between the two trains is 40%. How many kilometers does car B travel per hour?
甲、乙两列火车从相距480千米的两地同时相对开出，甲车每小时行80千米，2小时后两车相距全程40%．乙车每小时行驶多少千米？
<gadget id="calculator">40 / 100</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">480 * (3/10)</gadget>
<output>144</output>

<gadget id="calculator">144 - 80</gadget>
<output>64</output>

<result>64</result>