It takes 8 hours for a speedboat to travel from point A to point B; it takes 32 hours for a plastic floating object to drift from point A to point B. If other factors are not considered, it takes the speedboat from point B to point A. how many hours.
一艘快艇顺流而行，从A地到B地需要8个小时；一塑料漂浮物从A地漂流到B地需要32小时，若不考虑其他因素影响，该快艇从B地到A地需要多少小时．
<result>16</result>