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Emma and Jess ran in a 10-kilometer fun run. Emma finished the run in 4 hours, and Jess ran at an average speed that was

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Emma and Jess ran in a 10-kilometer fun run. Emma finished the run in 4 hours, and Jess ran at an average speed that was

by M7MBA » Tue May 12, 2020 6:42 am

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Emma and Jess ran in a 10-kilometer fun run. Emma finished the run in 4 hours, and Jess ran at an average speed that was 20 percent faster than Emma's. how many hours did Jess take to complete the run?

a) 2
b) 3
c) 3.33
d) 11/3
e) 24/5

[spoiler]OA=C[/spoiler]

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Re: Emma and Jess ran in a 10-kilometer fun run. Emma finished the run in 4 hours, and Jess ran at an average speed that

by Scott@TargetTestPrep » Tue May 19, 2020 6:26 am
M7MBA wrote: ↑
Tue May 12, 2020 6:42 am
 Emma and Jess ran in a 10-kilometer fun run. Emma finished the run in 4 hours, and Jess ran at an average speed that was 20 percent faster than Emma's. how many hours did Jess take to complete the run?

a) 2
b) 3
c) 3.33
d) 11/3
e) 24/5

[spoiler]OA=C[/spoiler]
Solution:

Emma’s rate was 10/4 = 5/2, so Jess’s rate was 5/2 * 1.2 = 5/2 * 6/5 = 3. Thus Jess’s time is 10/3 = 3.33 hours.

Answer: C

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