There are three people A, B, and C. A walks 50 meters per minute, B walks 40 meters per minute, and C walks 60 meters per minute. A and B start from the East Village, and C from the West Village, starting at the same time and walking toward each other. A meets C 40 minutes after departure, and how many minutes after departure B meets C.
有甲、乙、丙三个人，甲每分走50米，乙每分走40米，丙每分走60米．甲乙从东村，丙从西村，同时出发相向而行．甲出发后40分与丙相遇，乙出发后多少分与丙相遇．
<gadget id="calculator">50 + 60</gadget>
<output>110</output>

<gadget id="calculator">110 * 40</gadget>
<output>4_400</output>

<gadget id="calculator">40 + 60</gadget>
<output>100</output>

<gadget id="calculator">100 * 40</gadget>
<output>4_000</output>

<gadget id="calculator">4_400 - 4_000</gadget>
<output>400</output>

<gadget id="calculator">400 / 100</gadget>
<output>4</output>

<gadget id="calculator">40 + 4</gadget>
<output>44</output>

<result>44</result>