Vehicles A, B, and C are driving from A to B along the same road at the same time. On the way, a motorcyclist is also traveling in the same direction. The three vehicles take 7 minutes, 8 minutes, and 14 minutes to catch up with the rider. motorcycle man. It is known that car A travels 1000 meters per minute, and car C travels 800 meters per minute, what is the speed of car B?
甲、乙、丙三车同时从A地沿同一公路开往B地，途中有个骑摩托车的人也在同方向行进，这三辆车分别用7分钟、8分钟、14分钟追上骑摩托车人．已知甲车每分钟行1000米，丙车每分钟行800米，求乙车的速度是多少？
<gadget id="calculator">1_000 - 800</gadget>
<output>200</output>

<gadget id="calculator">200 * 7</gadget>
<output>1_400</output>

<gadget id="calculator">14 - 7</gadget>
<output>7</output>

<gadget id="calculator">1_400 / 7</gadget>
<output>200</output>

<gadget id="calculator">800 - 200</gadget>
<output>600</output>

<gadget id="calculator">1_000 - 600</gadget>
<output>400</output>

<gadget id="calculator">400 * 7</gadget>
<output>2_800</output>

<gadget id="calculator">2_800 / 8</gadget>
<output>350</output>

<gadget id="calculator">600 + 350</gadget>
<output>950</output>

<result>950</result>