You will achieve this in 15 days. Both 5 and 3 have a least common multiple of 15.
If the clock loses 0.1 hours every day, it will take 120 days to lose a total of 12 hours. Counting 120 days from May 17 leads to September 14.
The constant of variation is 5 because 4 multiplied by 5 equals 20.
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