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kevin&win [631867] · MS 2015 · 쪽지

2016-01-20 15:21:00
조회수 3,125

틀린다면 이런문제? 1등급저지자객문제 [논스탑 섹시 캐빈]

게시글 주소: https://old.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!

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kevin&win [631867]

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