Two people, A and B, start from the east and west banks of the lake at the same time and swim to the opposite bank, and then swim back immediately, keeping a constant speed. It is known that the first meeting point is 600 meters away from the west bank of the lake, and the second meeting point is 600 meters away from the east bank of the lake. The shore is 400 meters, how many meters is the distance from the third meeting point to the west shore of the lake?
甲、乙两人分别自湖的东西两岸同时出发各游到对岸后立即往回游，并保持匀速，已知两人第一次相遇点距湖西岸600米，第二次相遇点距湖东岸400米，求第三次相遇点距湖西岸多少米？
<gadget id="calculator">600 * 5</gadget>
<output>3_000</output>

<gadget id="calculator">600 * 3</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 - 400</gadget>
<output>1_400</output>

<gadget id="calculator">1_400 * 2</gadget>
<output>2_800</output>

<gadget id="calculator">3_000 - 2_800</gadget>
<output>200</output>

<result>200</result>