A and B work together to make a batch of parts. A makes 24 parts per hour. After 6.5 hours of cooperation, B makes 78 more parts than A. How many parts does B make per hour?
甲乙两人合做一批零件，甲每小时做24个，合作6.5小时后，乙比甲多做78个，乙每小时做多少个零件？
<gadget id="calculator">78 / 6.5</gadget>
<output>12</output>

<gadget id="calculator">24 + 12</gadget>
<output>36</output>

<result>36</result>