There are two rice fields in Xiaokang, with a total harvest of 5,712 kg of rice. The first area is 4.8 hectares, with an average yield of 680 kg of rice per hectare. The second area is 3.4 hectares. How much is the average yield of rice per hectare?
小康有两块水稻田，共收稻谷5712千克，第一块面积4.8公顷，平均每公顷产稻谷680千克，第二块面积3.4公顷，平均每公顷产稻谷多少千克？
<gadget id="calculator">4.8 * 680</gadget>
<output>3_264</output>

<gadget id="calculator">5_712 - 3_264</gadget>
<output>2_448</output>

<gadget id="calculator">2_448 / 3.4</gadget>
<output>720</output>

<result>720</result>