An explorer is caught in a whiteout (in which the snowfall is so
thick that the ground cannot be distinguished from the sky) while
returning to base camp. He was supposed to travel due north for 5.2
km, but when the snow clears, he discovers that he actually
traveled 8.4 km at 49o north of due east.
(a) How far and (b) in what
direction (south of due west) must he now travel to reach base
camp?
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