A total of 680 kilometers from A to B, a truck and a passenger car drive towards each other from both places at the same time, and they meet after 5 hours. The speed of the truck is (7/10) that of the passenger car. What is the speed of the passenger car?
从甲地到乙地共680千米，一辆货车和一辆客车同时从两地开出相向而行，5小时后相遇．货车速度是客车的(7/10)，客车速度是多少？
<gadget id="calculator">680 / 5</gadget>
<output>136</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 + (7/10)</gadget>
<output>17/10 = around 1.7</output>

<gadget id="calculator">136 / (17/10)</gadget>
<output>80</output>

<result>80</result>