SOLUTION: When Kelsey is not on the moving sidewalk, she can walk the length of the sidewalk in 3 minutes. If she stands on the sidewalk as it moves, she can travel the length in 2 minutes.

Question 1023419: When Kelsey is not on the moving sidewalk, she can walk the length of the sidewalk in 3 minutes. If she stands on the sidewalk as it moves, she can travel the length in 2 minutes. If Kelsey walks on the sidewalk as it moves, how many minutes will it take her to travel the same distance? Assume she always walks at the same speed.
Answer by josgarithmetic(39630) (Show Source): You can put this solution on YOUR website!
This is much like a job or task rates question. The task is "walk or move the length of the sidewalk".

x is the time for Kelsey alone to do the one job.

AGENTS WHICH MOVE                  RATES
Kelsey                              1/3
Mover                               1/2
Kelsey combined with mover          1/x

The rate of Kelsey while ON the moving sidewalk if Kelsey is also walking will be the sum of their individual rates.

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