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aksik [14]
3 years ago
13

Michelle rode her bicycle from her house to school at an average speed of 8 miles per hour. Later that day, she rode from school

back home along the same route at an average speed of 12 miles per hour. If the round trip took one hour, how many miles long is the round trip?
Mathematics
1 answer:
Crazy boy [7]3 years ago
8 0

9514 1404 393

Answer:

  9.6 miles

Step-by-step explanation:

Let x represent the round trip distance. Then Michelle's time was ...

  t = distance/speed

  1 = (x/2)/8 +(x/2)/12 = x(1/16 +1/24) = x(3/48 +2/48) = x(5/48)

  48/5 = x = 9.6

The round trip is 9.6 miles.

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Answer:

Age of Eva =  15 Years

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Step-by-step explanation:

Let the age of Eva be X years

Given that Carrie is 3 times as old as Eva

Therefore age of Carrie = 3X YEARS.

__________________________________________________________

After 15 years

Age of Eva = X + 15

Age of Carrie = 3X +15

Given that Carrie is twice as old as Eva

so according to this condition

age of Carrie = 2*Age of Eva

Substituting the age of Eva and Carrie

3X +15 = 2*(X + 15 )

=> 3X +15 = 2X +30

=> 3X - 2X = 30 - 15

=> X = 15

Since X was assumed age of Eva so age of Eva is 15 years

age of Carrie = 3X years = 3*15 = 45 years.

4 0
3 years ago
The Lunar New Year festival is a 15-day celebration. How many weeks is that? Find the decimal number of weeks that is the same a
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Diana uses 30 grams of coffee beans to make 48 fluid ounces of coffee. When guests come, she makes 96 fluid ounces of coffee. Ho
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