Verified answer

this is a standard resolution of vectors question.

You have been given the hypotenuse of a triangle and you want the opposite ( north)

and the adjacent ( east)

opp/hyp = sin(theta)

adj/hyp = cos (theta)

hence north = 2.80 *sin(15deg)

and east = 2.80 * co0s(15 deg)

That depends on where they start from. If the second person starts from where the first person ends up, then person #2 doesn't have to walk any distance at all. Even if they both start from the same location, the vector arithmetic in some of the answers is wrong. It would work only on a flat Earth, but the real Earth is round. For example, if the start point is at 89 degrees North latitude, then the second person should go 2.545 km East and 1.297 km North. And if the start point is 89 deg 59 minutes North, then the second person should go 4.328 km ( ! ) East, then 1.297 km North.