The speed of the truck is 50 km/h and the speed of the car is 80 km/h. Two cars drive from A to B at the same time, and the car arrives at B at 5:00, how long will it take for the truck to arrive at B?
货车的速度是50千米/时，轿车的速度是80千米/时．两车同时从甲地开往乙地，轿车用5时到乙地，货车还需要多长时间到乙地？
<gadget id="calculator">5 / 50</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">80 * (1/10)</gadget>
<output>8</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<result>3</result>