Mr. Chua worked 4 h 15 min in the morning and 5 h 40 min in the afternoon. He had a 1.5-hour lunch in between work. If he left his office at 7.25 p.m. At what time did he start working in his office? Give your answer in 24-hour clock.
Question
Mr. Chua worked 4 h 15 min in the morning and 5 h 40 min in the afternoon. He had a 1.5-hour lunch in between work. If he left his office at 7.25 p.m. At what time did he start working in his office? Give your answer in 24-hour clock.
Solution
First, let's calculate the total time Mr. Chua spent at work, including his lunch break.
He worked for 4 hours and 15 minutes in the morning, and 5 hours and 40 minutes in the afternoon. This totals to 9 hours and 55 minutes.
He also took a 1.5-hour lunch break.
So, the total time he spent at work is 9 hours and 55 minutes + 1.5 hours = 11 hours and 25 minutes.
He left his office at 7.25 p.m. To find out when he started work, we need to subtract the total time he spent at work from the time he left.
7.25 p.m. is 19:25 in 24-hour clock.
So, 19:25 - 11 hours and 25 minutes = 08:00.
Therefore, Mr. Chua started working at 08:00 in the morning.
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