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수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
자동차 가,나,다 가 있다. 이 세 자동차들은 각각 시속 100,110,95km의 속력으로 평지에서 달린다. 그러나 산을 오르면 속력이 시속 5km감소하고, 내리막길을 가면 시속 8km증가한다.
문제 1. 이 세 자동차가 총 1000km의 길을 가야 한다. 평지가 절반, 나머지 절반의절반은 산이고 남은 코스는 내리막이다. 이 차들이 길의 끝까지 가는데 걸리는 시간을 각각 구하여라.(차는 도로의 한쪽 끝에서 출발)
문제 2. 이 세 차들은 시간당 각각 3L,4L,5L의 휘발유를 사용한다. 그런데 위와 같은 길을 달리려 하는데 휘발유가 한 차당 10L의 휘발유밖에 없다. 각 차당 도로 끝까지 도착하는데 몇 L의 휘발유가 더 필요한지 구하여라.
(풀이필수)
-
△π
Lv.9
2020.04.01 17:41
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△π
Lv.9
2020.04.01 20:13
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