Question

please help me i will medal and fan

Answer 1

It took Jimena 89 minutes to run a 15-kilometer race last weekend. If you know that 1 kilometer equals 0.621 mile, how many minutes did it take Jimena to run 1 mile during the race? Round your answer to the nearest hundredth.

3.68 minutes
9.55 minutes
9.88 minutes
24.15 minutes

Answer 2

First, you would need to know how many minutes it took her to run 1 kilometer. This would be set up in a proportion:
\[\frac{ 15 }{ 89 } = \frac{ 1 }{ x }\]
Solve for x to find how many kilometers she ran in 1 minute. Then transfer it to minutes per mile. Do you know how to do that?

Answer 3

u would cross multiply?

Answer 4

okay so jimena's rate is 15 km/ 89 minutes

convert this to 0.16853932584 km/ min

which is equal to 0.16853932584(.621) miles/min

set that [rate] equal to d/t

so 0.16853932584(.621)=d [1 mile]/t

solve for t

Answer 5

To solve for x, yep

Answer 6

I am sorry, but I don't know how to do that... could you help?

Answer 7

To solve proportions, you cross-multiply by multiplying the terms that are diagonal to each other.

Answer 8

So what would that be?

Answer 9

89/15x?

Answer 10

Yes! Now solve for x

Answer 11

She takes 89 min to cover (15×0.62)miles
So for 9 miles time is 89min.
For 1mile time taken is 89/9minutes
=9.88min. (Approximately)

Answer 12

5.9333333

Answer 13

Yep, now multiply it by the conversion of km to miles to find the answer (Hint: Multiply it by 0.621)

Answer 14

9.88?? (rounded)

Answer 15

Hold on, I screwed up. You have to convert the 15 km into miles using the conversion given.

Answer 16

Do you know how to do that?

Answer 17

Once you find how many miles is in 15km, you set up the same proportion we did earlier, except swap the 15 with the new value that you get

Answer 18

Then solve for x

Answer 19

so what do i end up with? 9.88 is not the answer. @MichaelAlex292

Answer 20

Its not 9.88, its actually 9.55. Sorry I screwed up :l

Answer 21

Look above

Answer 22

its alright... thanks!

Answer 23

No problem :)