Page 169 - NUMINO Challenge_D1
P. 169
Answer
Key
3 When you look from the center of the pentagon, 4 The time is correct only when the hands overlap.
the angle formed at each vertex is 360 5 72 . Since the hands overlap 22 times in 24 hours,
The hour hand moves 72 2 144 from 12 the clock will show the correct time 22 times in a
o'clock, so it is between 4 o'clock (120 ) and 5 day.
o'clock (150 ). The minute hand has moved 72
4 288 from 4 o'clock. Since the minute hand
moves 6 per minute, 288 6 48 minutes
have passed. Therefore, the time is 4 : 48.
NUMINO Challenge D1
Key
3 When you look from the center of the pentagon, 4 The time is correct only when the hands overlap.
the angle formed at each vertex is 360 5 72 . Since the hands overlap 22 times in 24 hours,
The hour hand moves 72 2 144 from 12 the clock will show the correct time 22 times in a
o'clock, so it is between 4 o'clock (120 ) and 5 day.
o'clock (150 ). The minute hand has moved 72
4 288 from 4 o'clock. Since the minute hand
moves 6 per minute, 288 6 48 minutes
have passed. Therefore, the time is 4 : 48.
NUMINO Challenge D1
