The distance between A and B is 1152 km. A train of passenger cars and a train of trucks drive from the two places at the same time. The truck travels 72 kilometers per hour, which is faster than the passenger car (2/7). How many hours does it take for the two cars to meet?
甲乙两地相距1152千米，一列客车和一列货车同时从两地对开，货车每小时行72千米，比客车快(2/7)，两车经过多少小时相遇？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 + (2/7)</gadget>
<output>9/7 = around 1.285714</output>

<gadget id="calculator">72 / (9/7)</gadget>
<output>56</output>

<gadget id="calculator">72 + 56</gadget>
<output>128</output>

<gadget id="calculator">1_152 / 128</gadget>
<output>9</output>

<result>9</result>