16. On Sunday, after Little Fat got up, he found that his alarm clock was broken. He estimated the time and set the alarm clock to 7:00, then he walked to the science museum and saw that the electronic clock on the roof pointed to 8:50. He visited the museum for one and a half hours and returned home at the same speed. When he got home, Little Fat saw that the alarm clock pointed to 11:50. Try to answer: At this time, to what time should the alarm clock be set to be accurate?
16. On Sunday, after Xiao Pang got up, he found that his alarm clock was broken. He estimated the time and set the alarm clock to 7:00, then he walked to the science museum and saw the electronic clock on the roof pointing to 8:50. After visiting the museum for one and a half hours, he returned home at the same speed. Upon arriving home, Xiao Pang saw the alarm clock pointing to 11:50. Try to answer: At this time, to what time should the alarm clock be set to be accurate?
【Solution】From the time shown on Xiao Pang's alarm clock, we know that Xiao Pang was out for: 11:50 - 7:00 = 4 hours 50 minutes.
The total time spent on the round trip: 4 hours 50 minutes - 1 hour 30 minutes = 3 hours 20 minutes, the time spent on the way back home: 3 hours 20 minutes ÷ 2 = 1 hour 40 minutes.
From the time Xiao Pang arrived at the science museum to the time he returned home, a total of: 1 hour 30 minutes + 1 hour 40 minutes = 3 hours 10 minutes, Xiao Pang arrived at the science museum at 8:50, so the time he got home is: 8:50 + 3 hours 10 minutes = 12:00, that is, the alarm clock should be set to 12:00.
Answer: At this time, the alarm clock should be set to 12:00 to be accurate.