Xiao Ming walks from home to school at a speed of 80 meters per minute. After 3 minutes, there is still (3/4) of the whole journey. If the distance from Xiao Ming's home to the school is drawn on a plan with a scale of 1/20,000, how many centimeters should it be drawn?
小明以每分80米的速度从家走向学校，3分后，还剩下全程的(3/4)．如果把小明家到学校的距离画在比例尺为二万分之一的平面图上，应画几厘米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">80 / (1/4)</gadget>
<output>320</output>

<gadget id="calculator">1 / 20_000</gadget>
<output>1/20_000 = around 0.00005</output>

<gadget id="calculator">3 * 320 * 100 * (1/20_000)</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>