The school playground is 80 meters long and 60 meters wide. The teacher runs 5 laps every day. How many kilometers does he run in a week?
学校操场的长80米，宽60米，老师每天跑5圈，他一星期共跑多少千米？
<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">7 / 1_000</gadget>
<output>7/1_000 = around 0.007</output>

<gadget id="calculator">140 * 2 * 5 * (7/1_000)</gadget>
<output>49/5 = around 9.8</output>

<result>49/5 = around 9.8</result>