Input (grade 4): A kilosecond (symbol: ks) is 1000 seconds (16 minutes, 40 seconds), so there are 86.4 kiloseconds in a 24 hour day, and 604.8 kiloseconds in a week.
Output (grade 5): A kilosecond is 1000 seconds (16 minutes, 40 seconds), so there are 86.4 kiloseconds in a 24 hour day.