and B jointly produce a batch of parts. A produces 28.5 pieces per hour, and B produces 35 pieces per hour. A is delayed for an hour because of machine repairs on the way. After 5 hours, all the parts of this batch are produced. How many?
甲乙两人共同生产一批零件，甲每小时生产28.5个，乙每小时生产35个，甲在中路途因为修理机器耽误了一小时，5小时后，这批零件全部生产完，这批零件一共有多少个？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">28.5 * 4</gadget>
<output>114</output>

<gadget id="calculator">35 * 5</gadget>
<output>175</output>

<gadget id="calculator">114 + 175</gadget>
<output>289</output>

<result>289</result>