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If it takes 3 hours to travel 24 miles downstream and 6 hours to travel downstream, how fast is the current...
...if the speed of the boat remains constant?
1 mph
2 mph
3 mph
4 mph
show me how you got the answer, please.
one more detail: it's 6 hours UPSTREAM. (thanks for noticing that, kate1976). =]
2 Answers
- 2 decades agoFavorite Answer
if the question is: If it takes 3 hours to travel 24 miles downstream and 6 hours to travel UPstream, how fast is the current? then,
lets call the travelling speed Vt and the current speed Vc
downstream we have Vt+Vc=24miles/3hours=8mph
upstream we have Vt-Vc=24/6=4mph
to solve the system of two equations we can add the equations and get 2Vt=12, Vt=6mph
Vc=8-6=6-4=2mph
The current is 2mph fast.
