Halliday, Resnick & Walker — Motion in Two and Three Dimensions: Problem 93

Oasis A is 90 km due west of oasis B. A desert camel leaves A and takes 50 h to walk 75 km at $37^\circ$ north of due east. Next it takes 35 h to walk 65 km due south. Then it rests for 5.0 h. What are the (a) magnitude and (b) direction of the camel's displacement relative to A at the resting point? From the time the camel leaves A until the end of the rest period, what are the (c) magnitude and (d) direction of its average velocity and (e) its average speed? The camel's last drink was at A; it must be at B no more than 120 h later for its next drink. If it is to reach B just in time, what must be the (f) magnitude and (g) direction of its average velocity after the rest period?