Posted by **bushra** on Friday, February 15, 2013 at 6:16am.

a hiker walk due east at 4km per hour and a second hiker starting from the same point walks 55 degree north-east at the rate of 6km per hour. H

ow far apart will they be after 2 hours

- maths -
**Reiny**, Friday, February 15, 2013 at 10:12am
the hiker walking east walked 8 km

the hiker walking 55° NE walked 12 km

Since I am not sure what notation of direction you are using,

e.g. is it N55°E OR simply 55° up from the positive x-axis direction OR

I will interpret that the angle between their paths is 55°

So by the cosine law

x^2 = 8^2 + 12^2 - 2(8)(12)cos55°

= 97.87332..

x = √97.87....

=appr 9.89 km

If your angle is different from my interpretation, just make the changes at the end of the equation.

- maths -
**bushra**, Sunday, February 17, 2013 at 10:42am
i m having a problem that the angle between north east will be 35 or 55 because if we are considering north east the hiker is moving fom north to east

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