Qian Hong and Gu Ying jointly typed a 1,820-character document on the computer at the same time. Qian Hong typed 120 words per minute, and Gu Ying typed 140 words per minute. How many minutes will it take for the two of them to finish typing this material?
钱红和顾颖用计算机同时合打一份1820个字的材料．钱红每分钟打字120个，顾颖每分钟打字140个．她俩打完这份材料，需用多少分钟？
<gadget id="calculator">120 + 140</gadget>
<output>260</output>

<gadget id="calculator">1_820 / 260</gadget>
<output>7</output>

<result>7</result>