The width of the 28-row planter is 4 meters. How many hectares of land can be sowed by a tractor that travels 5 kilometers per hour?
28行播种机的宽度是4米．用拖拉机牵引，每小时行5千米，可以播种多少公顷土地？
<gadget id="calculator">4 / 10_000</gadget>
<output>1/2_500 = around 0.0004</output>

<gadget id="calculator">5 * 1_000 * (1/2_500)</gadget>
<output>2</output>

<result>2</result>