anonymous
  • anonymous
Can someone explain this for me step by step? Abby rows 10 km upstream and 10 km back in a total time of 3 hr. The speed of the river is 5 km/h. Find Abby’s speed in still water. @mark_o.
Algebra
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
You found me lol
anonymous
  • anonymous
yeah im here now lol :D |dw:1354646559750:dw|
anonymous
  • anonymous
she row from starting point A to B then from B to A that is time from A to B + time from B to A = 3 hours

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

anonymous
  • anonymous
ok
anonymous
  • anonymous
time Tab + T ba = 3 (1) but distance d=velocity x time,. therefore t=d/v dAB dBA ------ + ------- =3 but distances dBA=dAB=10 km v v 10 10 ------- + ------ =3 v v but note that velocity of river is v=5 km/hr for upstream v= v+5 10 10 for down stream v= v-5, therefore ------- +------ = 3 v+5 v-5 you can algebra now ion finding v=?
anonymous
  • anonymous
i mean you can do the algebra now from this point ... :D
anonymous
  • anonymous
ummmm I am stuck
anonymous
  • anonymous
I am sorry lol
anonymous
  • anonymous
10/(v+5) + 10 /(v-5) =3 10(v-5) + 10(v+5) ------------------ =3 (v+5)(V-5)
anonymous
  • anonymous
do multiplication and addition to simplify the numerator and the denominator..:D
anonymous
  • anonymous
give me a sec
anonymous
  • anonymous
wow i suck cause I am lost
anonymous
  • anonymous
|dw:1354590455411:dw|
anonymous
  • anonymous
|dw:1354590757893:dw|
anonymous
  • anonymous
the v is throwing me off
anonymous
  • anonymous
10 10 -------- + ------- = 3 (v+5) (v-5) ? ------------------- =3 (v+5) (v-5)
anonymous
  • anonymous
20
anonymous
  • anonymous
|dw:1354591224584:dw|
anonymous
  • anonymous
for the further left, that is (v+5)(v-5) -----------= ? then mult by 10 (v+5)
anonymous
  • anonymous
then on the mid of it (v+5)(v-5) -----------= ? then mult by 10 (v-5)
anonymous
  • anonymous
|dw:1354591397442:dw|
anonymous
  • anonymous
10(v-5) + 10(v+5 ------------------- = 3 (v+5)(v-5)
anonymous
  • anonymous
|dw:1354591544810:dw|
anonymous
  • anonymous
ok give me a sec and let me figure this out
anonymous
  • anonymous
multiply the numerator then do addition on the denominator multiply them also
anonymous
  • anonymous
|dw:1354591871260:dw|
anonymous
  • anonymous
is that right
anonymous
  • anonymous
hhm where did you get 10-5 and 15+5 from? it should stay as 10( v-5)=? and 10(v+5)=?
anonymous
  • anonymous
I SUBTRACTED AND ADDED 10 FROM BOTH (V-5)(V+5)
anonymous
  • anonymous
10-5=5 AND 10+5=15
anonymous
  • anonymous
I just want to understand it
Hero
  • Hero
I guess you didn't like my explanation
anonymous
  • anonymous
no i asked you a question and you left
anonymous
  • anonymous
I just hate math and it takes me awhile to get it together
Hero
  • Hero
Well, I just answered your question
Hero
  • Hero
I left the room to help someone else with their question, but you should not assume that I had left.
anonymous
  • anonymous
it should stay as 10( v-5)=? and 10(v+5)=? 10( v-5)= 10v -50 is it ? and 10(v+5)= 10v +50 is it ?
anonymous
  • anonymous
ahh you have posted this before..yeah @andjie when we start coaching you dont assume that we had left .. :D
anonymous
  • anonymous
Thank you I am sorry
Hero
  • Hero
@mark_o. I am convinced you are doing this the hard way.
anonymous
  • anonymous
and for the denominator (v+5)(V-5)=?
anonymous
  • anonymous
haha i know..:D im sorry @Hero ...:D
Hero
  • Hero
Go check out my solution
anonymous
  • anonymous
where is that? lol... :D
Hero
  • Hero
I'll do anything to avoid a quadratic equation
Hero
  • Hero
Besides, I don't like when you get to a result where you have two solutions but have to discard one of them because it is negative.
anonymous
  • anonymous
i think andjie is just doing the refresher thing now.. to recall everything .. that was 7 years ago ? @ andjie?
anonymous
  • anonymous
9 almost ten years ago
anonymous
  • anonymous
wait I just had my high school reunion so it was 10 years ago lol
Hero
  • Hero
She's probably 28 years old
anonymous
  • anonymous
wow, almost 10 years ago? hmmm yeah this is a good refresher to you ... :D
anonymous
  • anonymous
29
Hero
  • Hero
I just posted a link to the solution
anonymous
  • anonymous
hhhm i cant open it, dont know why @Hero
anonymous
  • anonymous
I understand this better @hero hopefully I can do more like this
Hero
  • Hero
d = rt and let r = b ± w b = speed of the boat w = speed of the water current t1 = Upstream time t2 = Downsteam time 10 = 5t 2 = t1 t1 + t2 = 3 2 + t2 = 3 t2 = 3 - 2 t2 = 1 Upstream Formula d = rt1 d = (b - w)t1 Downsteam Formula: d = rt2 d = (b + w)t2 b - w = 5 Upstream 10 = 2(b - w) Downsteam 10 = (b + w) 10 = 2b - 2w 20 = 2b +2w 30 = 4b 30/4 = b 7.5 = b 10 = b + w 10 = 7.5 + w 10 - 7.5 = w 2.5 = w Therefore The speed of the boat was 7.5 km/h
anonymous
  • anonymous
ok this is good,, directly for the solutions and answer.... ;D
anonymous
  • anonymous
you did really avoid the quadratic equation .. :D
anonymous
  • anonymous
You guys are just too smart for me
Hero
  • Hero
I usually find ways to avoid it.
Hero
  • Hero
It's a personal goal of mine
anonymous
  • anonymous
lol
anonymous
  • anonymous
ok that is very good.... and andjie can copy this one to study and do for a second solution or alternate solution..........:D
anonymous
  • anonymous
Thank you @mark_o. you always look out for me
Hero
  • Hero
Well, back to watching Smallville. I'm trying to get to the end of the 10th season and it's taking forever.
anonymous
  • anonymous
Have fun and thank you for your help
anonymous
  • anonymous
ok YW,, tc now and have fun solving..........:D
anonymous
  • anonymous
thanks for doing the alternative solution, that was a good one :D @Hero...............:D
Hero
  • Hero
You're welcome. I have plenty alternative solutions up my sleeve.
Hero
  • Hero
If you need an alternative solution, cite me.

Looking for something else?

Not the answer you are looking for? Search for more explanations.