Uncle Zhang typed 680 characters in 8 minutes, calculated according to this. How many minutes does Uncle Zhang need to type a 3,400-word manuscript?
张叔叔8分钟打了680个字，照这样计算．张叔叔打一篇3400字的稿件，需要多少分钟？
<gadget id="calculator">680 / 8</gadget>
<output>85</output>

<gadget id="calculator">3_400 / 85</gadget>
<output>40</output>

<result>40</result>