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KonstantinChe [14]
3 years ago
15

A circular running tack is 1/4mile long. Elena runs on this track, completing each lap in 1/20of an hour. What is Elena's runnin

g speed?
Please add step by step explanation.
Mathematics
2 answers:
Nina [5.8K]3 years ago
7 0

Answer:

Elena's running speed is 5 miles/hour

Explanation:

The speed is defined as the covered distance per unit time

In the problem, we have:

The distance covered is the length (circumference) of the circular track which is given as of a mile.

We are also given that she completes each lap (she completes of a mile) in of an hour

To get her speed, we will divide the distance covered by the time taken to cover this distance

This is done as follows:

speed = miles/hour

This means that:

Elena can run 5 miles each hour

vlabodo [156]3 years ago
5 0

Answer:

5 miles per hour

Step-by-step explanation:

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Step-by-step explanation:

Let the angle near point A be A.

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Answer:

y = -1/2x + 3.5

Step-by-step explanation:

The gradients of perpendicular lines multiply to make -1. The gradient of the line given is 2, so 2 multiplied by something gives us -1. 2 × -1/2 = -1. The gradient of the perpendicular line is -1/2

y = -1/2x + c

Now we can substitute x = 1 and y = 3 into the equation:

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The equation of the line is y = -1/2x + 3.5

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Answer:

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