SOLUTION: If Jim road his bike 6 miles per hour one way and Sarah walked 1/3 of a mile per hour the other way, how long would it take them to be 21 miles apart?

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Question 121090: If Jim road his bike 6 miles per hour one way and Sarah walked 1/3 of a mile per hour the other way, how long would it take them to be 21 miles apart?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
For each one, d = rxt
and the sum of their distances needs to be 21 mi
For Jim:
d+=+6t
For Sarah:
d+=+%281%2F3%29t
6t+%2B+%281%2F3%29t+=+21
multiply both sides by 3
18t+%2B+t+=+63
19t+=+63
t+=+3.316hrs answer
or
3hrs .316%2A60min
3hrs 19min
I can check this. I should get the same answer
if Jim alone went 21 miles at 6.333 mi/hr
21+=+6.333%2A3.316
21+=+20.999988 close enough