Which expression represents the distance Kelli traveled downstream? 0.1(x – 5)0.1(x + 5)

Downstream, the current helps Kelli move faster, so her speed is her still-water speed plus the current: x + 5. Distance equals speed multiplied by time, and the time is 0.1, so the distance is 0.1(x + 5). This is choice B.

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