Asked by Anthony
The mad river flows at a rate of 2 KM/H. In order for a boat to travel 79.2 KM of River and then return in a total of eight hours how fast must about travel in Still water?
Answers
Answered by
bobpursley
time upriver=distance/(S-2)
time downriver= distance/(s+2)
8hours=79.2 ( 1/(s-2) + 1/(s+2))
a bit of algebra, but get a common denominator on the right (s^2-4),
8hours=79.2 ( s+2 + s-2)/s^2-4
then combine, put it in quadratic form, and solve for s.
time downriver= distance/(s+2)
8hours=79.2 ( 1/(s-2) + 1/(s+2))
a bit of algebra, but get a common denominator on the right (s^2-4),
8hours=79.2 ( s+2 + s-2)/s^2-4
then combine, put it in quadratic form, and solve for s.
Answered by
Taj
You should be able to get 20 km/h as your answer.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.