A man launches his boat from point A on a bank of a straight river,1 km wide,and wants to reach point B,1 km downstream on the opposite bank,as quickly as possible.He could row his boat directly across the river to point C and then run to B,or he cou
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A man launches his boat from point A on a bank of a straight river,1 km wide,and wants to reach point B,1 km downstream on the opposite bank,as quickly as possible.He could row his boat directly across the river to point C and then run to B,or he cou
A man launches his boat from point A on a bank of a straight river,1 km wide,and wants to reach point B,1 km downstream on the opposite bank,as quickly as possible.He could row his boat directly across the river to point C and then run to B,or he could row directly to B,or he could row to some point D between B and C and then run to B.If he can row 6 km/h and run 8 km/h,where should he land to reach B as soon as possible?(We assume that the speed of the water is negligible compared to the speed at which the man rows.)
___________km from C
A man launches his boat from point A on a bank of a straight river,1 km wide,and wants to reach point B,1 km downstream on the opposite bank,as quickly as possible.He could row his boat directly across the river to point C and then run to B,or he cou
楼上那位你的回答不对吧,题目要求是时间最短啊,而不是距离最短.顺便说下,我认为楼主“1 km downstream on the opposite bank”这句话打错了吧,应该是10 km downstream on the opposite bank.你看看是不是?
if the speed of the water is negligible, I think he should row directly from A to B, for, as we all know, a triangle, the sum of two sides is bigger than the third side.
此道题意是一个人要从A点划船到B点,问在不考虑水...
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if the speed of the water is negligible, I think he should row directly from A to B, for, as we all know, a triangle, the sum of two sides is bigger than the third side.
此道题意是一个人要从A点划船到B点,问在不考虑水流的情况下,从A到C或D,再从C或D到B比较快还是从A直接到B快。根据三角形定律,两边之后大于第三边,从A直接到B的距离是最短的,固在不考虑水流的情况下,从A直接到B是最快的。
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