무브

오르비

아톰

내 태그

내 태그 설정

입시
학습
생활
클럽
직업·취업
Epioptimus
Centurion

kevin&win [631867] · MS 2015 · 쪽지

2016-01-20 15:21:00
조회수 3,028

틀린다면 이런문제? 1등급저지자객문제 [논스탑 섹시 캐빈]

게시글 주소: https://9.orbi.kr/0007683407


Will it take longer to swim to a point 100 yards up-stream and back,

or to a point 100 yards across-stream and back?

Let us take a numerical example.

Suppose the swimmer's speed is 50 yards a minute in still water, and the current is 30 yards a minute.

Thus the speed against the current is 20, and with the current 80 yards a minute.

Going across-stream the swimmer must aim at a point E above the point B where he wishes to arrive, so that OE represents his distance travelled in still water, EB the amount he has drifted down. These must be in the ratio 50 to 30, and we then know from the right-angled triangle OBE that OB will correspond to 40. Since OB is 100yards, OE is 125yards.

You must see the attached file above or picture

Which is faster? Why?

You Orbian?  prove it!

I don't give u any answer, U Orbian? get me the answer!

0 XDK (+0)

  1. 유익한 글을 읽었다면 작성자에게 XDK를 선물하세요.

kevin&win [631867]

쪽지 보내기

글쓰기
오르비 1363624번째 회원 가입
ddna
1,422,072 건의 게시물이
블록체인에 디지털 공증되었습니다.
901,751
497,321
22,267
574
159

오늘의 추천 글

2026 수능D - 330

오르비 플레이

오르비 RARE

오르비 과외시장
Move
our corporate site
Orbi Class
on-line classes
Atom
educational books & resources
Gae9
humor and fun

© 2000-2024 Move Inc.

orbisoptimus (v17-7e2515)