typist needs a 21,000-word manuscript, and plans to finish it in 12 hours. Due to the increased typing speed, he typed 250 more words per hour. How many hours did it actually take to finish the manuscript?
一个打字员要大21000字书稿，计划用12小时打完，由于提高了打字的速度，每小时多打了250个字，打完这份书稿实际用了几小时？
<gadget id="calculator">21_000 / 12</gadget>
<output>1_750</output>

<gadget id="calculator">1_750 + 250</gadget>
<output>2_000</output>

<gadget id="calculator">21_000 / 2_000</gadget>
<output>21/2 = around 10.5</output>

<result>21/2 = around 10.5</result>