Xiaopang folded 15 thousand paper cranes in 0.3 hours, Xiaoya folded 16 thousand paper cranes in 0.4 hours. They folded 36 thousand paper cranes at the same time, so how much time will it take in total?
小胖0.3小时折15只千纸鹤，小亚0.4小时折16只千纸鹤．他们同时合折36只千纸鹤，那么总共需要多少时间？
<gadget id="calculator">15 / 0.3</gadget>
<output>50</output>

<gadget id="calculator">16 / 0.4</gadget>
<output>40</output>

<gadget id="calculator">50 + 40</gadget>
<output>90</output>

<gadget id="calculator">36 / 90</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>