The excursion boat on the river takes 2.5h; hours to make the trip to a point 12 miles upstream and to return.If the rate at which the boat travels in still water is 5 times the rate of the river current,what is the rate of the current?
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![The excursion boat on the river takes 2.5h; hours to make the trip to a point 12 miles upstream and to return.If the rate at which the boat travels in still water is 5 times the rate of the river current,what is the rate of the current?](/uploads/image/z/1464428-20-8.jpg?t=The+excursion+boat+on+the+river+takes+2.5h%3B+hours+to+make+the+trip+to+a+point+12+miles+upstream+and+to+return.If+the+rate+at+which+the+boat+travels+in+still+water+is+5+times+the+rate+of+the+river+current%2Cwhat+is+the+rate+of+the+current%3F)
The excursion boat on the river takes 2.5h; hours to make the trip to a point 12 miles upstream and to return.If the rate at which the boat travels in still water is 5 times the rate of the river current,what is the rate of the current?
The excursion boat on the river takes 2.5h; hours to make the trip to a point 12 miles upstream and to return.If the rate at which the boat travels in still water is 5 times the rate of the river current,what is the rate of the current?
The excursion boat on the river takes 2.5h; hours to make the trip to a point 12 miles upstream and to return.If the rate at which the boat travels in still water is 5 times the rate of the river current,what is the rate of the current?
设 the rate of the current is v,则 the rate of the boat travels is 5v,
有12/(4v)+12/(6v)=2.5,v=2
河上的游艇需要2.5小时,小时完成了这趟旅程上游和返回12英里。如果船旅行的速度在静水河的5倍,当前的速度是什么?
中文解释为:河上的游艇需要2.5小时,小时完成了这趟旅程上游和返回12英里。如果船旅行的速度在静水河的5倍,当前的速度是什么?
设速度为x则6/(5x-x)+6/(5x+x)=2.5
则x=1英里/小时
(a) True;
(b) true;
(c) true;
(d) false;