At two o'clock, due to grandpa's eyesight problem, the original two points were changed to 12: 00 and 10. When Xiaohua came home from school, the clock showed two points. Although time is not allowed, the interval is constant, just one hour and fifty minutes away. So Xiaohua's real school time should be 2 o'clock+this hour and fifty minutes is exactly 3: 50.