China's first aircraft carrier "Liaoning Ship" parked 5 fighter jets. After the first one took off, another fighter took off every 4 minutes. After the first one took off, 2 minutes later, a fighter plane flew back to the ship and landed. , after that, every 6 minutes, a fighter plane lands; the landing fighter planes take off after the original 5 fighter planes every 4 minutes, how many minutes have passed since the first fighter plane took off, and there are no fighter planes on the aircraft carrier?
中国第一艘航空母舰"辽宁舰"上停着5架战斗机，第1架起飞后，每隔4分钟便有一架接着起飞，在第1架起飞2分钟后，有一架战机飞回到舰上降落，此后每隔6分钟，有一架战机降落；降落的战机依次每隔4分钟在原有5架战机之后起飞，从第一架战机起飞，经过多少分钟航空母舰上就没有战斗机？
<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 - 1 - (1/3)</gadget>
<output>11/3 = around 3.666667</output>

<gadget id="calculator">1 + (11/3)</gadget>
<output>14/3 = around 4.666667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/4) - (1/6)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(14/3) / (1/12)</gadget>
<output>56</output>

<gadget id="calculator">56 + 4</gadget>
<output>60</output>

<result>60</result>