contestada

Given the speeds of each runner below, determine who runs the fastest.
\text{Stephanie runs 13 feet per second.}
Stephanie runs 13 feet per second.
\text{Emily runs 538 feet in 45 seconds.}
Emily runs 538 feet in 45 seconds.
\text{Brooke runs 1 mile in 560 seconds.}
Brooke runs 1 mile in 560 seconds.
\text{Katie runs 749 feet in 1 minute.}
Katie runs 749 feet in 1 minute.

Respuesta :

znk

Answer:

Stephanie  

Step-by-step explanation:

To compare each runner's speed, we must convert them all to the same units.

Let's convert then all to feet per second.

1. Stephanie

Speed = 13 ft/s

2. Emily

[tex]\text{Speed} = \dfrac{\text{538 ft}}{\text{45 s}} = \text{12.0 ft/s}[/tex]

3. Brooke

[tex]\text{Speed} = \dfrac{\text{1 mi}}{\text{560 s}} \times \dfrac{\text{5280 ft}}{\text{1 mi}} = \text{9.4 ft/s}[/tex]

4. Katie

[tex]\text{ speed} = \dfrac{\text{747 ft}}{\text{1 min}} \times \dfrac{\text{1 min}}{\text{60 s}} = \textbf{12.4 ft/s}[/tex]

Stephanie is the fastest runner.

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