Two ships, A and B, sail from Shanghai to Qingdao along the same route at the same time. After 18 hours, ship A fell 576 kilometers behind ship B. Ship A travels an average of 32.5 kilometers per hour, how many kilometers per hour does boat B travel on average?
甲乙两条船沿同一航线同时从上海开往青岛．经过18小时后，甲船落在乙船后面576千米．甲船平均每小时行32.5千米，乙船平均每小时行多少千米？
<gadget id="calculator">32 + 32.5</gadget>
<output>64.5</output>

<result>64.5</result>