Yesterday your chronometer read 11h 59m 58s at the 1200 GMT time tick. Today your chronometer reads 12h 00m 00s at the 1200 time tick. What is the chronometer rate?

Correct Answer: Option D — +2s

The rate is the difference between the chronometer's error on two consecutive days. Yesterday, the chronometer was 2 seconds slow (11h 59m 58s). Today, it is on time (12h 00m 00s). The chronometer has gained 2 seconds over the 24-hour period, resulting in a daily rate of +2s.