The distance between A and B is 380km. A bus travels from A to B at a distance of 80km per hour. After the whole journey (4/19), a truck drives from B to A. After another 2 hours, the two vehicles meet. How many miles does the truck travel per hour?
甲、乙两城相距380km，客车从甲城开往乙城，每小时行驶80km，行驶了全程的(4/19)时，一辆货车从乙城开往甲城，再经过2小时两车相遇．货车每小时行多少千米？
<gadget id="calculator">4 / 19</gadget>
<output>4/19 = around 0.210526</output>

<gadget id="calculator">1 - (4/19)</gadget>
<output>15/19 = around 0.789474</output>

<gadget id="calculator">(15/19) * 380</gadget>
<output>300</output>

<gadget id="calculator">300 / 2</gadget>
<output>150</output>

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

<result>70</result>