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denpristay [2]
2 years ago
11

Three runners, Dirk, Edith, and Foley all start at the same time for a $24$ km race, and each of them runs at a constant speed.

When Dirk finishes the race, Edith is $8$ km behind, and Foley is $12$ km behind. When Edith finishes the race, how far behind is Foley, in km
Mathematics
1 answer:
kompoz [17]2 years ago
4 0

Answer:

$12$ km

Step-by-step explanation:

IF THIS HELPED YOU PLS MARK ME BRAINLIEST I NEED IT

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In the problem 4x + 10 list a term, factor, coefficient, and constant.​
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term- 4x and 10

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6 0
3 years ago
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.

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6 0
3 years ago
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