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Function: driver
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Function: get_footer
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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
space
2020.09.16 23:24
조회 378
난 이제 친구와 함께 섬으로 간다
그런데 가는 도중 배에 물이 차올랐다
4초가 지났더니 배의 100L중 2L가 물로 차있다
그러니까 +0.5L/s가 된다
그런데 안에 양동이가 있었다
양동이는 -3L/s인데 퍼는 시간과 붓는 시간은 5초다(단, 배 안에 물이 3L 미만이라면 남아있는 양 만큼만 퍼진다)
그러고 보니 난방 기구로 물을 증발 시킬 수 있다
난방 기구는 -75%/s(남아있는 물의 75%가 증발 한다는 것이다) 이지만 물 늘어나는 양이 1초에 1.5L씩 늘어난다
그럼 양동이 1분, 난방기구 1분씩 번갈아 가며 쓴다고 할 때 배는 물에 잠길까?
지금 바로
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