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A boat propelled so as to travel with a speed of 0.5m/s in still water, moves directly (in a straight line) across a river that is 60m wide. The river flows with a speed of 0.30m/s. How long in seconds does it take the boat to cross the river?

  • Physics - ,

    tanA = 0.3/0.5 = 0.6
    A = 31o

    D = 60/cos31 = 70 m.

    V = 70/cos31 = 0.583 m/s

    D = V*t = 70 m.
    0.583*t = 70
    t = 120.1 s.

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