Why 08:17?

Geometry Level 3

A clock reads 08:17. What is the angle in degrees between the hour hand and the minute hand? Round your answer to the nearest integer.


The answer is 147.

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1 solution

Marta Reece
Jun 8, 2017

Location of the hour hand corresponds to the time 8 + 17 60 = 8.78 3 8+\frac{17}{60}=8.78\overline3 , so the angle from top of the clock to the hand, measured clockwise, is

8.78 3 12 × 36 0 = 248. 5 \dfrac{8.78\overline3}{12}\times360^\circ=248.5^\circ

The angle of the minute hand with the top of the clock, measured clockwise, is

17 60 × 36 0 = 10 2 \dfrac{17}{60}\times 360^\circ=102^\circ

The difference between the two is 248.5 102 = 146.5 147 248.5-102=146.5\approx\boxed{147}

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