Two trains, A and B, are running toward each other from south and north at the same time. A train travels 50 kilometers per hour, and train B travels 42 kilometers per hour. The two trains meet at a distance of 40 kilometers from the midpoint. , How many kilometers is the distance between the two places in the north?
甲、乙两列火车，同时从南、北两地相向而行，甲车每小时行50千米，乙车每小时行42千米，两车在离中点40千米处相遇，求南、北两地间的距离是多少千米？
<gadget id="calculator">50 - 42</gadget>
<output>8</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">50 + 42</gadget>
<output>92</output>

<gadget id="calculator">40 * (1/4) * 92</gadget>
<output>920</output>

<result>920</result>