To complete 84 hours, how many revolutions will the hour hand of a clock make?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 7
The hour hand goes once round the dial, through all 12 hour marks, in 12 hours. So the number of revolutions is the number of 12-hour periods in the given time.
Revolutions in 84 hours \(\displaystyle =\frac{84}{12}=7\)
Tip: The hour hand makes 2 revolutions a day, but the minute hand makes 24, one every hour.