Xiao Ming walks from home to school in the morning. Halfway through the journey, his father finds that Xiao Ming’s math books are left at home, and then rides to deliver the books to Xiao Ming. When he catches up, Xiao Ming still has (1/5) of the distance to go Xiao Ming then got into his father's car and was taken to school by his father. In this way, Xiao Ming arrived at school 5 minutes earlier than walking alone. How long does it take Xiao Ming to walk from home to school?
小明早上从家步行去学校，走完一半路程时，爸爸发现小明的数学书丢在家里，随即骑车去给小明送书，追上时，小明还有(1/5)的路程没有走完，小明随即上了爸爸的车，由爸爸送往学校，这样小明比独自步行提早5分钟到校．小明从家到学校全部步行需要多少时间？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/5) - (1/2)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(4/5) / (3/10)</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">1 / (8/3)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">5 / (5/8) / (1/5)</gadget>
<output>40</output>

<result>40</result>