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physics

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can you help me through this?

A boat moves through a river at 7.0 m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 3.5 m/s, how long does it take the boat to make a round trip consisting of a 250 m displacement downstream followed by a 250 m displacement upstream?

  • physics - ,

    timetotal=timedown+time up
    = 250m/(10.5m/s)+ 250/(3.5m/s)

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