## anonymous one year ago help will give medal (01.03) A student runs 100 meters in 11 seconds. What is the speed of the student? speed = distance over time ; 1 mile = 1609 meters (2 points) 9.1 miles per hour 16 miles per hour 20.3 miles per hour 24 miles per hour

1. anonymous

First, you're going to want to convert meters to miles, so you are working with the right distance measurement. 100 meters in equal to about 0.062 miles.

2. anonymous

Give me just a second.

3. BearKolch

d

4. anonymous

Alright, let's do this instead... Just plug in you're given values. Refer to that handy formula given to you. "speed = distance over time" which can also be written as s=d/t Since you're trying to find the runners speed, you would just fill in the appropriate variables with their values. His distance was 100, so d=100m His time was 11 seconds, so t=11s s=100/11 but now we have to convert...

5. anonymous

To convert meters to miles, you divide the amount of meters given (100) by the amount in a mile (1609). And convert seconds to hours, divide the amount of seconds given (11) by the amount in an hour (3,600). $s = \frac{ \frac{ 100 }{ 1609 } }{ \frac{ 11 }{ 3600 } }$

6. anonymous

Both numbers end up being a bit crazy... $s=\frac{ 0.06215 }{ 0.00306 }$

7. anonymous

s = 20.3

8. anonymous

9. anonymous

oh ok I forgot the division thank you so much

10. BearKolch

(what i said)

11. anonymous

@BearKolch It is better for the asker if you show them how to get the answer rather than just giving it. Also, D would be 24 miles per hour not 20.3

12. anonymous

no @BearKolch you said D and 20.3 is C

13. anonymous