Xiaohua walks 80 meters per minute from home to school, and arrives at school in 5 minutes. Today she wants to arrive at school 1 minute earlier. How much faster should she be?
小华从家到学校每分钟走80米，5分钟到校，今天她想提前1分钟到校，她速度应比原来加快多少？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">80 * (5/4)</gadget>
<output>100</output>

<gadget id="calculator">100 - 80</gadget>
<output>20</output>

<result>20</result>