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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] [★★★☆☆] 거울에 비친 시계
솔바람
2020.12.05 21:25
조회 559
철수는 보통 시계보다 시간이 절반의 빠르기로 흐르는 아날로그 시계를 가지고 있다.
어느 날, 철수는 집으로부터 30분 거리에 있는 마트에 가게 되었다.
이때 외출하기 전 아날로그 시계를 정상 시계의 시각과 똑같이 맞추었더니
시계의 시침과 분침이 75°를 이루었다.
마트에서 30분간 머무른 뒤, 철수는 다시 한 번 시계를 맞추려고 했다.
그런데 실수로 거울에 비친 아날로그 시계의 시각을 실제 시각으로 착각하면서
시계를 잘못 맞추게 되었다.
마트의 영업 시간이 오전 10시부터 오후 9시까지였다고 할 때,
철수가 집에 도착했을 때 철수의 아날로그 시계가 가리키는 시각과 정상 시계가 가리키는 시각은
몇 시간 몇 분 차이가 나는지 구하여라.
(단, 시계를 맞추는 데 걸린 시간은 계산하지 않으며 철수가 출발했을 때 분침은 시계의 1~12의 숫자 중 하나를 가리키고 있었다.)
-
NimNim
Lv.9
2020.12.05 22:16
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솔바람
Lv.10
2020.12.05 22:21
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꼬마수학자
Lv.4
2020.12.23 19:15
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솔바람
Lv.10
2020.12.23 19:29
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