Xiao Ming and grandpa went for a walk in the playground together. It takes Xiao Ming 8 minutes to walk around, and it takes 10 minutes for Grandpa to walk around. If two people start from the same place at the same time and go in the same direction, how many minutes will it take for Xiao Ming to surpass Grandpa by a full lap?
小明和爷爷一起去操场散步．小明走一圈需要8分钟，爷爷走一圈需要10分钟．如果两人同时同地出发，同方向而行，多少分钟后小明超出爷爷一整圈？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/8) - (1/10)</gadget>
<output>1/40 = around 0.025</output>

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

<result>40</result>