1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
borishaifa [10]
3 years ago
11

Question 6

Mathematics
1 answer:
Firdavs [7]3 years ago
7 0
So hmmmmm, notice... the boat went up in 3hrs, came back to the starting point in 2hrs, it went up 108km, it came back, well, from 108km to distance 0, so the distance on the way back is just the same 108km

now... let's say the stream has a speed rate of "r", and the boat has a still water speed rate of "b"

bear in mind that, when the boat is going UP, is not really going "b" fast, because the stream's "r" rate is going against it, and thus subtracting "r" from "b", so is really going " b - r " fast

when the boat is going down, is not going "b" fast either, because, again the stream's rate "r" is adding to it, because is going with the current, so is really going " b + r " fast

now, recall your d =rt, distance = rate * time

\bf \begin{array}{lccclll}
&distance&rate&time\\
&-----&-----&-----\\
upstream&108&b-r&3\\
downstream&108&b+r&2
\end{array}\\\\
-------------------------------\\\\
\begin{cases}
108=3(b-r)\implies \frac{108}{3}=b-r\\
\qquad 36=b-r\implies 36+r=\boxed{b}\\\\
108=2(b+r)\implies 54=b+r\\
\qquad 54=\boxed{36+r}+r
\end{cases}

solve for "r"

what's b?  well, 36+ r = b
You might be interested in
Anthony got a new iPhone. He needs to create a 4-digit passcode. How many passcodes can be created if REPETITION OF DIGITS IS AL
Snezhnost [94]
An infinite amount...since there ARE and infinite amount of number in the universe.

1111

2222

3333

4444

5555

6666

7777

8888

9999


1010

1234

4321

5432

2345

5678

8765

0987

7890

4509

9054

Etc
7 0
3 years ago
If one movie ticket cost $15, how much will 5 movie tickets cost
Anettt [7]

Answer:

$75

Step-by-step explanation:

15 x 5 = 75

trust me bro :)

7 0
2 years ago
What is 16 to the one billionth power
qwelly [4]
The answer Its 4.5281 ....etc
3 0
3 years ago
Pls help The surface area of a cone is given by the formula<br> S= al +712. Solve the formula for 2.
Luda [366]

Answer:

l = (S/pi)-r^2

Step-by-step explanation:

Just rearrange the equation.

S = pi*l + pi * r^2

S-pi*r^2 = pi*l

l = (S-pi*r^2)/pi

l = (S/pi)-r^2

7 0
2 years ago
How much longer will it take her to finish payin her bill?
Reika [66]

I would say, C.

hope this helps:)

3 0
2 years ago
Other questions:
  • 30 POINTS PLEASE ANSWER ASAP. The Diagram shows the front wooden wall of the warehouse in the shape of a trapezoid with a rectan
    7·1 answer
  • Order the following numbers from least to greatest <br> -9/2<br> 0<br> 1 3/5<br> 9/7<br> 2/3
    9·2 answers
  • Which equation represents the exponential function that goes through the points (0,4) and (3, 1/2).
    6·1 answer
  • Last week you worked 40 hours. This week, you worked 6 fewer hours than last week. How many hours did you work this week? _____
    12·2 answers
  • A store sells gift cards in preset amounts. You can purchase gift cards for ​$20 or ​$30. You have spent ​$680 on gift cards. Wr
    12·1 answer
  • What's the dependent variable shown in the table?
    10·2 answers
  • Answer question 4 pls for math
    15·1 answer
  • An antelope can run at a speed of 61 miles per hour. what is the speed on feet per second?
    14·1 answer
  • Evaluate the expression when b=3 and c=6.
    7·1 answer
  • Steve earns $8 per hour. his older brother earns $2 more per hour than Steve. what is the ratio of the money Steve earns in an h
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!