A train from Shijiazhuang to Beijing travels 100 kilometers per hour and arrives in 2.8 hours. After the train speeds up, it travels 140 kilometers per hour and leaves at 8:00 in the morning. When will it arrive?
一列火车从石家庄到北京，每小时行100千米，2.8小时到达，火车提速后每小时行140千米，上午8：00开出，几时到达？
<result>10</result>