You drive due east at 81km/h for 54mins . Then you follow a road going 60 degrees south of east, going 91km/h for another 39mins .
Find the x and y components of the displacement
d1 = 81km/h * (54/60)h=72.9 km @ 0 Deg
d2=91km/h * (39/60)h=59.2 km @ 300Deg
X = 72.9 + 59.2*cos300 = 102.5 km.
Y = 59.2*sin300 = -51.3 km