Let w=angular velocity

v=linear velocity

r=radius of circle

1 revolution=2pi radian

therfor

w=2pi/15 rad/s

NOTE:v=wr

r=v/w

since v=5m/s

therfor r=(5X15)/2pi

r=(75x7)/(2x22)=11.93=12m

hence the person will have to stand at a distance of 12m(approx) from the centre