anonymous
  • anonymous
please help me i will medal and fan
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
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
MichaelAlex292
  • MichaelAlex292
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?
anonymous
  • anonymous
u would cross multiply?

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anonymous
  • anonymous
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
MichaelAlex292
  • MichaelAlex292
To solve for x, yep
anonymous
  • anonymous
I am sorry, but I don't know how to do that... could you help?
MichaelAlex292
  • MichaelAlex292
To solve proportions, you cross-multiply by multiplying the terms that are diagonal to each other.
MichaelAlex292
  • MichaelAlex292
So what would that be?
anonymous
  • anonymous
89/15x?
MichaelAlex292
  • MichaelAlex292
Yes! Now solve for x
Pawanyadav
  • Pawanyadav
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)
anonymous
  • anonymous
5.9333333
MichaelAlex292
  • MichaelAlex292
Yep, now multiply it by the conversion of km to miles to find the answer (Hint: Multiply it by 0.621)
anonymous
  • anonymous
9.88?? (rounded)
MichaelAlex292
  • MichaelAlex292
Hold on, I screwed up. You have to convert the 15 km into miles using the conversion given.
MichaelAlex292
  • MichaelAlex292
Do you know how to do that?
MichaelAlex292
  • MichaelAlex292
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
MichaelAlex292
  • MichaelAlex292
Then solve for x
anonymous
  • anonymous
so what do i end up with? 9.88 is not the answer. @MichaelAlex292
MichaelAlex292
  • MichaelAlex292
Its not 9.88, its actually 9.55. Sorry I screwed up :l
MichaelAlex292
  • MichaelAlex292
Look above
anonymous
  • anonymous
its alright... thanks!
MichaelAlex292
  • MichaelAlex292
No problem :)

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