A TV series is 490 minutes long, and there are 210 minutes left after 7 episodes. How many minutes is an average episode?
一部电视片全长490分钟，播出7集后还剩210分钟．平均每集长多少分钟？
<gadget id="calculator">490 - 210</gadget>
<output>280</output>

<gadget id="calculator">280 / 7</gadget>
<output>40</output>

<result>40</result>