March 28, 2017

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Miguel is driving his motorboat across a river. The speed of the boat in still water is 10 mi/h. The river flows directly south at 3 mi/h. If Miguel heads directly west, what are the boat’s resultant speed and direction? Round answers to the nearest tenth.

  • geometry - ,

    you have a right triangle with legs 3 and 10.

    The resultant speed is the hypotenuse: √(36+100) = √136 = 11.7

    direction is W θ S

    where tanθ = 3/10, so that's W16.7°S

  • geometry - ,

    the resultant speed is the hypotenuse

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