It takes 2.5 hours to mow a piece of grass (1/5) with 2 lawnmowers. How many hours will it take to mow with 5 identical lawnmowers?
一片草地，用2台割草机2.5小时割草(1/5)，如果用5台相同的割草机割完要多少小时．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) / 2 / 2.5</gadget>
<output>0.04</output>

<gadget id="calculator">0.04 * 5</gadget>
<output>0.2</output>

<gadget id="calculator">1 / 0.2</gadget>
<output>5</output>

<result>5</result>