Xiao Ming ran a lap on the 360-meter-long circular track. In the first half of the time, he ran 5 meters per second, and in the second half of the time, he ran 4 meters per second. How many seconds did it take him to run the second half lap?
小明在360米长的环形跑道上跑了一圈，前一半时间里，他每秒跑5米，后一半时间里每秒跑4米．他跑后半圏用了多少秒．
<gadget id="calculator">360 / 2</gadget>
<output>180</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">360 / 9</gadget>
<output>40</output>

<gadget id="calculator">40 * 4</gadget>
<output>160</output>

<gadget id="calculator">180 - 160</gadget>
<output>20</output>

<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">4 + 40</gadget>
<output>44</output>

<result>44</result>