## Tal_Tal one year ago This is a kinda advanced question and I have 3 more but I will fan and medal! Please help! (02.08A)A hyena can run one over four mile in 22.5 seconds. Which of the following correctly shows this rate as miles per hour? one-fourth mile over twenty-two point five seconds = 40 miles per hour twenty-two point five seconds over one-fourth mile = 40 miles per hour one-fourth mile over twenty-two point five seconds = 90 miles per hour twenty-two point five seconds over one-fourth mile = 90 miles per hour Thank you!

1. Tal_Tal

@cliffordtapp

2. MrNood

you can work put units into an equation in the same way as numbers so look at this as a similar example: I can run 100m in 15 seconds -how fast is that in miles per hour? $\frac{ 100m }{ 15s } = \frac{ x miles }{ hour }$ 1mile = 1609 m 1 hour = 3600 seconds so $\frac{ 100m }{ 15s} \times \frac{ 3600s }{1 \min } \times \frac{ 1 mile }{ 1609m }$ you can see that the units cancle out to give miles/hour so multiply out th efractions to get your answer you just need to do the same with YOUR numbers

3. MrNood

! CORRECTION! middle term should be 3600s /1 HOUR

4. Tal_Tal

so I would put 1/4 a mile over 22.5 seconds?

5. Tal_Tal

I still don't really get it but oh well lol

6. MrNood

yes 1/4 mile/22.5s (that is the same as 1mile/4*22.5s) then put the conversion from seconds to hours (1hour = 3600s)

7. Tal_Tal

Wait hold on I think I get it. You put the mile on top and the seconds on the bottom

8. Tal_Tal

oooh now I get it! Thank you very much!!!

9. MrNood

np - well done