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Calendars and Clocks · Question 45 of 65

Question 45

MediumOriginal question

After the hands of a correct clock coincide, how many minutes pass before they coincide again?

Options for question 45

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. The minute hand has to gain a full 360∘360^\circ on the hour hand.

  2. It gains 5.5∘5.5^\circ per minute, so time =360÷5.5=72011=65511= 360 \div 5.5 = \frac{720}{11} = 65\frac{5}{11} minutes.

Worth noting

60 minutes ignores the hour hand's movement. Check: 11 meetings in 12 hours means 720÷11720 \div 11 minutes apart.

Concept
Interval between coincidences
Typical time
75 s
Your time
—
The rule this testsAngles between the hands
Practise this chapter →

Ten questions from Calendars and Clocks, at your own pace.

Practise this chapter →

Ten questions from Calendars and Clocks, at your own pace.