Posted by **hiba** on Monday, February 27, 2012 at 11:03am.

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 -
**Steve**, Monday, February 27, 2012 at 2:04pm
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 -
**Irene**, Sunday, March 11, 2012 at 4:03pm
the resultant speed is the hypotenuse

9+100=109

√109=10.4

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