Xiao Wang has a total distance of 3600 meters from his home to school. When he does not encounter a red light, he can reach the school in 72 minutes. Today the speed increased by 12.5%, but because of the red light, it still took 72 minutes to arrive. It is known that Xiao Wang needs to stop for 1 minute every time there is a red light, so how many times did he encounter red lights today?
小王从家到学校共3600米，没有遇到红灯时，72分钟可以到达．今天速度提高了12.5%，但因为遇到红灯，仍然72分钟才到达．已知每次红灯时，小王需要停1分钟，那么他今天一共遇到多少次红灯．
<gadget id="calculator">3_600 / 72</gadget>
<output>50</output>

<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">1 + 0.125</gadget>
<output>1.125</output>

<gadget id="calculator">50 * 1.125</gadget>
<output>56.25</output>

<gadget id="calculator">3_600 / 56.25 / 1</gadget>
<output>64</output>

<gadget id="calculator">72 - 64</gadget>
<output>8</output>

<result>8</result>