(12/15-c) + (12/15+c)= 2 I think?
heres the question A kayaker travels upstream 12 miles and then returns. The entire trip takes 2 hours. With no current, the kayaker paddles at a rate of 15 mph. How fast is the current of the stream?
Update:12/(15+c) + 12/(15-c)= 2 is what I have on paper just hard to write in text I need to know how to solve the equation
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As long as you have c with the denominator, like 12/(15-c) then it should work. C will be in mph.
Close. You were on the right track. Your parenthetsis were in the wrong spot though.
It would be 12/(15-c) + 12/(15+c)
The reason it is like this is because the effects of the current on his speed have to be calculated before the distance.
Your order of operations were just off slightly.
3 mph
2(15)=30 number of miles kayaker would travel without the current
2(12)=24 number of miles he/she traveled
30-24=6 number of miles lost to the current
6/2 = 3 ^^that divided by 2 because it was a round trip.
hope i helped!
Time = distance/speed
time upstream = 12/(15-x) hrs
time downstream = 12/(15+x) hrs
total time = 2 hours
so, 2=12/(15-x) + 12/(15+x)
Yep, you got the equation right.
Solve to get x= 6.7mph.
4.5 miles per hour i am a maths graduate so you can be sure im right ;)
it says there is no current.
it says there's no current?