There is a square watermelon field with a circumference of 2400 meters, and 5 tons of watermelons can be harvested per hectare. How many tons of watermelons can be harvested in total?
有一块正方形西瓜地，周长是2400米，每公顷收西瓜5吨，一共可收多少吨西瓜？
<gadget id="calculator">2_400 / 4</gadget>
<output>600</output>

<gadget id="calculator">2_400 / 4 / 10_000</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">600 * (3/50) * 5</gadget>
<output>180</output>

<result>180</result>