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
Klio2033 [76]
3 years ago
8

A paddleboat can move at a speed of 4 ​km/h in still water. The boat is paddled 12 km downstream in a river in the same time it

takes to go 6 km upstream. What is the speed of the​ river?

Mathematics
1 answer:
Bas_tet [7]3 years ago
3 0

Answer:

Speed of the river = \frac{4}{3} km per hour

Step-by-step explanation:

Speed of the boat in still water = 4 km per hour

Let the speed of the river = v km per hour

Speed of the boat upstream = (4 - v) km per hour

Time taken to cover 6 km = \frac{\text{Distance}}{\text{Speed}}

                                           = \frac{6}{4-v} hours

Speed of the boat downstream = (4 + v) km per hour

Time taken to cover 12 km = \frac{12}{4+v} hours

Since, time taken by the boat in both the cases is same,

\frac{6}{4-v}= \frac{12}{4+v}

6(4 + v) = 12(4 - v)

24 + 6v = 48 - 12v

12v + 6v = 48 - 24

18v = 24

v = \frac{24}{18}

v = \frac{4}{3} km per hour

You might be interested in
If Alex is 14 years old, and Ben is 17 years old, in how many years will the sum of their ages be 169 years?
Citrus2011 [14]

Answer:

69 years

Step-by-step explanation:

Sum of Alex's and Ben's current age

= 14 +17

= 31 years

For every year, Alex and Ben will each be one year older. Thus, 2 years would be added to the sum of their ages with each passing year.

Difference in the sum of their ages

= 169 -31

= 138 years

Number of sets of 2 years

= 138 ÷2

= 69

Thus, the sum of their ages will be 169 in 69 years.

6 0
2 years ago
Seth buys last year's best-selling novel, in hardcover, for $13.30$⁢13.30. this is with a 30%30% discount from the original pric
Nadusha1986 [10]
The answer is $19.00
8 0
3 years ago
Whats the common multiples of 3 and 7 up to 70
Furkat [3]
21, 42, 63


these are 20 characters lol
6 0
3 years ago
Read 2 more answers
Last month, Belinda worked 160 hours at a rate of 10.00 per hour. If her employer retains of her gross salary, is 1,500 reasonab
Luba_88 [7]

Answer:

100

Step-by-step explanation:

6 0
3 years ago
What is 637 divided by 9
kifflom [539]

Answer:

70.77778

Step-by-step explanation:

5 0
3 years ago
Other questions:
  • Suppose you travel at 70mph for 420 miles. How many hours will it take you to reach your destination?
    9·2 answers
  • Anyone I need help at this dont type other things. Pls now I need the solution anyone.
    12·1 answer
  • Convert the following standard form equation into slope-intercept form:<br> 6x + 5y = -15
    5·1 answer
  • I know its easy but i suck at math pls help
    14·2 answers
  • X=2 to x=7 calculate the average rate of change for the given function
    9·1 answer
  • 3. Sherri bought a package of pens that contained 15 pens. How many packages should she
    7·1 answer
  • It's math again! Please help!
    12·1 answer
  • How do you solve?3(t+4)-2(2t+3)=-4
    14·2 answers
  • Expanded notation on algebra<br> 24 x 12 x 12
    15·1 answer
  • four straws are arranged into the shape of a square with a diagonal of 8.5 inches. we rearrange the straws so that they form a n
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!