A and B plan to start from A and B at the same time and go towards each other. The two meet at C, but in fact A found that he forgot to bring his mobile phone after 5 minutes of departure and decided to speed up by 20% to return and start at an increased speed. Arrive at C at the same time as B, ask how many minutes after A and B originally planned to meet at C?
甲乙计划分别从A，B两地同时出发相向而行，两人相遇于C地，但实际上甲出发5分钟后发现忘记带手机了并决定提速20%返回再以提速的速度出发，这样才能和乙同时到达C地，问甲乙两人原计划出发后多少分钟相遇C地的？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">5 + 1 + 5</gadget>
<output>11</output>

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

<gadget id="calculator">1 + (-4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">11 / (1/5)</gadget>
<output>55</output>

<result>55</result>