A hiker walks from point P(1km,−2km) to point Q(6km,4km) and then to point R(−3km,−1km). Determine the magnitude of the net displacement from P to R and the angle it makes with the positive x-axis.
a) 10.3km,209∘
b) 4.1km,14∘
c) 4.1km,166∘
d) 7.8km,50∘