The distance between A and B is 380 kilometers. A car and a truck leave from A and B at the same time. The car travels 51.5 kilometers per hour, and after 3 hours there is still a distance of 27.5 kilometers from the truck. What is the speed of the truck?
甲乙两地相距380千米，一辆轿车和一辆货车同时从甲乙两地相对开出．轿车每小时行51.5千米，经过3小时后与货车还相距27.5千米．货车的速度是多少？
<gadget id="calculator">352.5 / 3</gadget>
<output>117.5</output>

<gadget id="calculator">117.5 - 51.5</gadget>
<output>66</output>

<result>66</result>