Uncle Wang went online for 240 hours in total, among which the ratio of chatting and studying was 3:5. His studying accounted for the online time ((())/(())), how many days chatting.
王叔叔共上网240小时，其中聊天和学习的比是3：5，他学习占上网时间((())/(()))，聊天多少天．
<result>3.75</result>