The distance between A and B is 200 kilometers. A tractor travels from A to B. After 20 kilometers, a car also goes from A to B. When the car arrives at B, the tractor is still 20 kilometers away from B. If the car catches up with the tractor, how many kilometers will the car be away from point B?
甲乙两地相距200千米，一台拖拉机从甲地去乙地，出发20千米后，一辆汽车也从甲地去乙地，当汽车到达乙地时，拖拉机离乙地还有20千米，求汽车追上拖拉机时，汽车离乙地还有多少千米？
<gadget id="calculator">20 + 20</gadget>
<output>40</output>

<gadget id="calculator">200 / 40</gadget>
<output>5</output>

<gadget id="calculator">5 * 20</gadget>
<output>100</output>

<gadget id="calculator">200 - 100</gadget>
<output>100</output>

<result>100</result>