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nekit [7.7K]
2 years ago
5

Two runners start the race at the same time. The first runner's speed is

Mathematics
2 answers:
ki77a [65]2 years ago
8 0

The speed of the first runner is 1.78 mph while for the second runner is 2.22 mph

<h3>Speed</h3>

Speed is the ratio of total distance to total time taken. It is given by:

Speed = distance / time

Let a represent the speed of the first runner and b for the second runner. Hence:

a = (4/5)b

After 30 minutes (0.5 hour), the runners are 2 miles apart, hence:

a = d₁ / 0.5

d₁ = 0.5a

Also:

b = d₂/0.5

d₂ = 0.5b

d₁ + d₂ = 2, hence:

0.5a + 0.5b = 2

0.5(4/5)b + 0.5b = 2

b = 2.22 mph

a = (4/5) * 2.22 = 1.78 mph

The speed of the first runner is 1.78 mph while for the second runner is 2.22 mph

Find  out more on Speed at: brainly.com/question/13943409

Lesechka [4]2 years ago
3 0

Answer:

16 mph and 20 mph (please mark brainiest)

Step-by-step explanation:

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Answer:

Option B and D .....

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4 0
2 years ago
HELP PLEASE
Nikolay [14]

Answer:

The 1st the 3rd and 4th are the answers

Step-by-step explanation:

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3 years ago
In a classic Conan Doyle story, Sherlock Holmes solves a crime mystery by recognizing that a guard dog didn't bark. Therefore, t
ohaa [14]

Answer:

G. Modus tollens

Step-by-step explanation:

This question used the inference called modus tollens.

Modus tollens is a a valid form of argument that is of this form below:

<em>If S, then T</em>

<em>i</em><em>f not S, then not T.</em>

S = dog doesn't know perpetrator

Not S = dog knows who the perpetrator is

T = the dog barked

Not T = the dog did not bark.

So if we put this into the statement in bold letters, we would have:

The dog doesn't know perpetrator, so it barked.

And,

The dog didn't bark, so it knows the perpetrator.

3 0
3 years ago
James has 375 pennies. he spends 3/5 of them and gives 1/3 of the remainder to his sister. how many pennies does he have left?
Mariulka [41]

Answer:

375 * 3/5 =225

375 - 225 = 150

150 * 1/3 = 50

150 - 50 = 100

Step-by-step explanation:

4 0
2 years ago
The price of an emergency light is $375 and it decreased by
KATRIN_1 [288]

The price of the light as a function of x is given by the exponential function:

p(x) = \$375*(0.98)^x

<h3>Which exponential model represents this situation?</h3>

We know that the original price of the light is $375.

This value decreases a 2% each year, so each year we need to multiply the above price by (1 - 2%/100%) = (1 - 0.02) = 0.98

Then, if x represents the number of years, the price of the light as a function of x is given by the exponential function:

p(x) = \$375*(0.98)^x

if you want to learn more about exponential functions:

brainly.com/question/11464095

#SPJ1

3 0
2 years ago
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