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Two hikers come to a fork in the road, where the paths diverge at an angle of 39 degrees

Hiker A heads down one path at 6.2 km/h, while hiker B moves down the second path at 5.4 km/h.
After travelling for an hour and a half, hiker A shoots up a flare that rises 0.8 km into the air.
With what angle of elevation (to the nearest degree) does the hiker B see the flare when it is
at its highest point? [6]

 May 7, 2020
 #1
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After 1 1/2 hr hike A has travelled   1 1/2 x 6.2       Hiker B has travelled  1 1/2 x 5.4

  Use law of cosines to find the distance between the two hikers at this point

       then the tangent of  angle in question will be    .8 km / (distance between hikers)

 May 7, 2020

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