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Luda [366]
3 years ago
8

I will give brailiest just be fast

Mathematics
2 answers:
Natali [406]3 years ago
7 0
The third answer is the correct answer i just had that question
lana [24]3 years ago
4 0

Answer: The third one I think i'm so sorry if it's wrong

Step-by-step explanation:

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If it takes 6 hours for a plane to travel 720km with a tail wind and 8 hours to make the return trip with a head wind. Find the
denis-greek [22]

The speed of wind and plane are 105 kmph and 15 kmph respectively.

<u>Solution:</u>

Given, it takes 6 hours for a plane to travel 720 km with a tail wind and 8 hours to make the return trip with a head wind.  

We have to find the air speed of the plane and speed of the wind.

Now, let the speed wind be "a" and speed of aeroplane be "b"

And, we know that, distance = speed x time.

\text { Now, at tail wind } \rightarrow 720=(a+b) \times 6 \rightarrow a+b=\frac{720}{6} \rightarrow a+b=120 \rightarrow(1)

Now at head wind → 720=(a-b) \times 8 \rightarrow a-b=\frac{720}{8} \rightarrow a-b=90 \rightarrow(2)

So, solve (1) and (2) by addition

2a = 210

a = 105

substitute a value in (1) ⇒ 105 + b = 120

⇒ b = 120 – 105 ⇒ b = 15.

Here, relative speed of plane during tail wind is 120 kmph and during head wind is 90 kmph.

Hence, speed of wind and plane are 105 kmph and 15 kmph respectively.

6 0
3 years ago
Can someone please help me answer this?
ozzi
For this problem i got

7 0
3 years ago
Which statement about the ordered pairs (-9, 3) and (2, - 4) is true for the equation 6.0 6x - 142 2 9. 3) is a solution to the
CaHeK987 [17]

Answer:

It should be Neither ordered pair is a solution

Step-by-step explanation:

I take the same math lol

7 0
3 years ago
Can someone please help me with this question :)
Ugo [173]

Answer:

Step-by-step explanation:

Sin80° = opp/hyp

Sin80° = 21/y

ysin80° = 21

y = 21/sin80°

y = 21.3

6 0
3 years ago
Martha has $180. She needs a total of $2,000 to start investing in stocks. She earns $60 per day working, of which she saves $50
DIA [1.3K]
So she earns $60 per day working, but only saves $50. To solve this equation you have to multiply $50 to each day she works. If the total has to be exactly $2,000 then you must multiply 50 x 36.4 and that equals $2,000.
Your answer should be 36.4 days.
4 0
3 years ago
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