Xiaoxia and Xiaoyue put together a puzzle each, and they started to put together at the same time. Xiaoxia put together a piece every 2 minutes on average, and finished the last piece at 16:24. Xiaoyue put together a piece every 3 minutes, and finished the last piece at 17:36. One piece, the first piece you started to put together when you asked them how much?
小夏与小悦各拼一块拼图，两个人同时开始拼，小夏平均每隔2分钟拼上一块，16时24分钟拼完最后一块，小悦每隔3分钟拼一块，17时36分拼完最后一块，问它们多少时开始拼的第一块？
<result>14</result>