John walked 10 miles on Saturday. He walked twice as fast on the second 5 miles of his walk than he walked on
the first 5 miles of his walk. Which expression represents the time he spent walking? Let x = John's speed on the first
half of his walk.

Question

John walked 10 miles on Saturday. He walked twice as fast on the second 5 miles of his walk than he walked on
the first 5 miles of his walk. Which expression represents the time he spent walking? Let x = John's speed on the first
half of his walk.

cloverracer · Answer

15/x

5/3x

15/2x

10/3x

cloverracer · Answer

@love10129151

jim_thompson5910 · Answer

if x = John's speed on the first half of his walk. , and He walked twice as fast on the second 5 miles of his walk than he walked on the first 5 miles of his walk

then what is the speed for the second half of his walk?

cloverracer · Answer

10..?

jim_thompson5910 · Answer

x = speed on first half

speed on second half = ??? (he's walking twice as fast as the prev speed)

cloverracer · Answer

would the answer be 15/2x since the 2 stands for twice and x stands for his speed

jim_thompson5910 · Answer

don't worry about the answer choices right now

jim_thompson5910 · Answer

2x is the speed on the second half of the walk

jim_thompson5910 · Answer

First half

D = r*t

5 = x*t

5/x = t

t = 5/x

-------------

Second half

D = r*t

5 = 2x*t

5/2x = t

t = 5/2x

jim_thompson5910 · Answer

So his time on the first half is 5/x

the time on the second half is 5/(2x)

add those up to get your answer

cloverracer · Answer

so it would be 10/3x

jim_thompson5910 · Answer

you can't add the denominators like that

jim_thompson5910 · Answer

in order to add two fractions, the denominators must be the same and once they are, they don't change

jim_thompson5910 · Answer

example

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