Engineering class emergency rescue. When they worked (1/3), half of the people were transferred. After the rest of the people worked for 4 hours, they transferred two recruit classes. The efficiency of the recruit class was 35% of that of the engineering class, and finally it was 3 hours earlier. Finish. How many hours was originally planned?
工程班抢险救援．当他们干到(1/3)时，调走了一半人，剩下的人干了4小时后，调来了两个新兵班，新兵班的效率是工程班的35%，最终提前3小时完成．原计划多少小时完成？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">0.35 * 2</gadget>
<output>0.7</output>

<gadget id="calculator">0.7 - 1</gadget>
<output>-0.3</output>

<gadget id="calculator">(1/2) + (-0.3)</gadget>
<output>0.2</output>

<gadget id="calculator">5 / 0.2</gadget>
<output>25</output>

<gadget id="calculator">25 + 4 + 3</gadget>
<output>32</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">32 / (2/3)</gadget>
<output>48</output>

<result>48</result>