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7 October, 03:33

a boat going upstream at 4 mph then travels downstream at 10 mph. what is the rate of the boat in still water

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  1. 7 October, 03:36
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    7 mph

    Step-by-step explanation:

    If b is the rate of the boat, and s is the rate of the stream, then:

    b - s = 4

    b + s = 10

    Solve the system of equations with substitution or elimination. Using elimination, add the equations together:

    2b = 14

    b = 7

    The boat's rate is 7 mph.
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