The passenger car and the truck depart from the east and west cities at the same time, and meet each other in 4 hours. After the meeting, the bus travels to the west city in another 3 hours. What percentage of the whole journey is the average hour of the truck?
客车和货车同时从东、西两城相对开出，4小时相遇，相遇后客车又行3小时到达西城，货车平均每小时行全程的几分之几？
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/7) / 4</gadget>
<output>3/28 = around 0.107143</output>

<result>3/28 = around 0.107143</result>