Yesterday your chronometer read 11h 59m 59s at the 1200 GMT time tick. Today the chronometer reads 11h 59m 57s at the 1200 time tick. What is the chronometer rate?

Correct Answer: Option B — -2s

The chronometer rate is the daily gain or loss. Since the chronometer read 11h 59m 59s yesterday and 11h 59m 57s today at the same time tick, it has lost 2 seconds over the 24-hour period. A loss of time is denoted by a negative sign, resulting in -2s.