A and B start from two places at the same time and walk toward each other. A is 50 kilometers per hour, and B is 40 kilometers per hour. As a result, the two met at a distance of 40 kilometers from the midpoint. Find the distance between the two places.
甲乙两人从两地同时出发，相向而行．甲每小时50千米，乙每小时40千米．结果两人在离中点40千米处相遇．求两地距离．
<gadget id="calculator">50 + 40</gadget>
<output>90</output>

<gadget id="calculator">50 - 40</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 * (1/5)</gadget>
<output>8</output>

<gadget id="calculator">90 * 8</gadget>
<output>720</output>

<result>720</result>