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    Calculate the speed of the current.

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    Mike's boat will go 15 miles per hour in still water.

    If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of the current?

    Please show a complete solution to the problem.

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    Solution Preview

    Remember the equation, distance = rate * time.

    The problem tells us that Mike's boat goes 15 mph in still water. We do not know the speed of the current, so let us call it r.

    We will set up two equations using the ...