Tim spent 50 minutes doing his homework before he took a 30-minute break. He then continued with his homework and completed it 30 minutes later. At what time did he start doing his homework if he completed his homework at 18 30?
From the given information, we can deduce that Tim spent a total of 50 + 30 + 30 = <<50+30+30=110>>110 minutes on his homework.
Since there are 60 minutes in an hour, 110 minutes is equal to 110/60 = <<110/60=1.83>>1.83 hours.
Therefore, Tim started doing his homework at 18:30 - 1.83 = 16:47. Answer: \boxed{16:47}.
Tim spent 50 minutes doing his homework before he took a 30-minute break. He then continued with his homework and completed it 30 minutes later. At what time did he start doing his homework if he completed his homework at 18 30?
Express your answer using the 24 hour clock.
Tim spent a total of 50 + 30 = <<50+30=80>>80 minutes on his homework before taking a break.
He then spent an additional 30 minutes on his homework after the break.
Therefore, he spent a total of 80 + 30 = <<80+30=110>>110 minutes on his homework.
To convert this to hours, we divide 110 minutes by 60: 110 / 60 = 1.83333...
This means Tim spent approximately 1.83 hours on his homework.
If Tim completed his homework at 18:30, and he spent 1.83 hours on it, he must have started at 18:30 - 1.83 = 16:47.
Therefore, Tim started doing his homework at 16:47 using the 24-hour clock.
To find out at what time Tim started doing his homework, we need to subtract the total time he spent on his homework and the break from the time he completed it.
First, let's calculate the total time Tim spent doing his homework and the break:
Homework time: 50 minutes
Break time: 30 minutes
Additional homework time: 30 minutes
Now, we can calculate the total time Tim spent on his homework and the break:
Total time = Homework time + Break time + Additional homework time
Total time = 50 minutes + 30 minutes + 30 minutes
Total time = 110 minutes
Since we know that Tim completed his homework at 18:30, we need to subtract the total time from this completion time to find the starting time:
Starting time = Completion time - Total time
To subtract the time, consider converting the completion time and the total time to a common unit, such as minutes. Then, subtract and convert back to hours and minutes.
Completion time: 18:30
Convert the completion time to minutes:
18 hours * 60 minutes/hour + 30 minutes = 1110 minutes
Starting time = 1110 minutes - 110 minutes
Convert back to hours and minutes:
Starting time = 1000 minutes
Therefore, Tim started doing his homework at 16:40.