The length of the road between A and B is 770 km. A passenger car and a truck depart from two places at the same time, the truck travels 50 kilometers per hour, and the speed of the passenger car is 1.2 times the speed of the truck. How many hours later will the bus and truck meet?
甲乙两地间的公路长是770千米．客车和货车同时从两地相对开出，货车每小时行50千米，客车速度是货车速度的1.2倍．几小时后客车和货车相遇？
<gadget id="calculator">50 * 1.2</gadget>
<output>60</output>

<gadget id="calculator">50 + 60</gadget>
<output>110</output>

<gadget id="calculator">770 / 110</gadget>
<output>7</output>

<result>7</result>