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Susan drives her car at an average speed of [tex]$s$[/tex] miles per hour for [tex]$t$[/tex] hours and travels 215 miles. Which of the following equations represents this information?

A. [tex]s \cdot t = 215[/tex]

B. [tex]215 + t = s[/tex]

C. [tex]\frac{s}{t} = 215[/tex]

D. [tex]s + t = 215[/tex]

Answer :

Certainly! Let's break down the problem step by step.

The problem provides the following information about Susan's car trip:

1. Average Speed: Susan drives at an average speed of [tex]\( s \)[/tex] miles per hour.
2. Time Driven: She drives for [tex]\( t \)[/tex] hours.
3. Distance: She travels a distance of 215 miles.

We need to find an equation that represents this information accurately.

Step 1: Recall the Formula for Distance

The basic formula that relates distance, speed, and time is:

[tex]\[ \text{Distance} = \text{Speed} \times \text{Time} \][/tex]

Step 2: Apply Given Values to the Formula

From the problem:

- The speed is [tex]\( s \)[/tex] miles per hour.
- The time is [tex]\( t \)[/tex] hours.
- The total distance is 215 miles.

Substituting these values into the formula, we get:

[tex]\[ \text{Distance} = s \times t = 215 \][/tex]

Step 3: Identify the Correct Equation

Now, compare this derived equation with the given choices:

1. [tex]\( s \times t = 215 \)[/tex]

This matches our derived equation.

2. [tex]\( 215 + t = s \)[/tex]

This does not represent the relationship between speed, time, and distance.

3. [tex]\( \frac{s}{t} = 215 \)[/tex]

This does not fit the standard formula for calculating distance.

4. [tex]\( s + t = 215 \)[/tex]

This implies speed plus time equals 215, which is incorrect.

Therefore, the correct equation that represents the given information is:

[tex]\[ s \times t = 215 \][/tex]

This confirms that the equation [tex]\( s \times t = 215 \)[/tex] is the correct representation of the situation.

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