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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

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Answer:

Plane SPT and Plane SPV

Step-by-step explanation:

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A plane 'R' has been given in the picture.

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Therefore, possible names may be,

SPT, STV, SPV, PTV

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3 years ago
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4 0
3 years ago
Flights arriving to DTW might be national or international. Assume that one out of every five national flights is followed by an
Dvinal [7]

Answer:

1/15

Step-by-step explanation:

Given

1 out of every 5 national flight is followed by an international flight.

p = 1/5

q = 1 - p

q = 1 - 1/5

q = 4/5

π0 = 0.25

We want to determine

p:the fraction of international flights that are followed by a national flight.

Let X = 0

If the nth flight is national

Let X = 1

if the flight is international

This gives rise to a two state Markov chain with transition probability as follows

P = (4/5. 1/5. p. 1-p)

The long run proportion are the below solution gotten from the Markov chain above

π0 = 4/5π0 + pπ1 ----- 1

π1 = 1/5π0 + (1 - p)π1---- 2

π0 + π1 = 1 -----------. 3

Solving the above equations,

We have

Substitute 0.25 for π0 in (3)

0.25 + π1 = 1

π1 = 1 - 0.25

π1 = 0.75

Solving 1 and 3

Substitute 0.75 for π1 and 0.25 for π0 in (1)

0.25 = 4/5 * 0.25 + 0.75p

0.25 = 0.2 + 0.75p

0.75p = 0.25 - 0.2

0.75p = 0.05

p = 0.05/0.75

P = 1/15 or 0.0667(6.67%)

So, one out of every 15 international flights is followed by a national flight (or 6.66 percent)

3 0
3 years ago
4x2 is the GCF of this polynomial.
viva [34]

Answer:

Correct option is B

Step-by-step explanation:

Note that

20x^2y=2\cdot 2\cdot 5\cdot x\cdot x\cdot y,

56x^3=2\cdot 2\cdot 2\cdot 7\cdot x\cdot x\cdot x.

If the mystery term is 22x^3=2\cdot 11\cdot x\cdot x\cdot x, then the

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If the mysteyr term is 24x^2y=2\cdot 2\cdot 2\cdot 3\cdot x\cdot x\cdot y, then

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If the mysteyr term is 26x^2y=2\cdot 13\cdot x\cdot x\cdot y, then

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If the mysteyr term is 28y^3=2\cdot 2\cdot 7\cdot y\cdot y\cdot y, then

GCF(20x^2y,56x^3,28y^3)=2\cdot 2=4.

Thus, correct option is B

8 0
3 years ago
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