Asked by Nancy
a motorboat can go 24 miles downstream in the same amount of time that it takes to go 12 miles upstream. The boats speed in still water is 12 mph. What is the speed of the river?
mi/hr?
mi/hr?
Answers
Answered by
Reiny
let the speed of the river be x mph
speed up stream = 12-x mph
time to go upstream = 24/)12-x)
speed downstream = 12+x
time to go downstream = 12/(12+x)
but those times are equal, so ...
24/(12-x) = 12/(12+x)
cross-multiply and solve for x
speed up stream = 12-x mph
time to go upstream = 24/)12-x)
speed downstream = 12+x
time to go downstream = 12/(12+x)
but those times are equal, so ...
24/(12-x) = 12/(12+x)
cross-multiply and solve for x
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.