Xiaolin has to walk 10 minutes from his home to school, and he has already walked 7. There is still 240 meters away from the school. How far does Xiaolin have to walk from home to school?
小林从家到学校要走10分，已经走了7分离学校还有240米，小林从家到学校要走多远？
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">240 / (3/10)</gadget>
<output>800</output>

<result>800</result>