Sheena can row a boat at 3.10 mi/h in still water. She needs to cross a river that is 1.11 mi wide with a current flowing at 1.77 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream.
a) What is her speed with respect to the starting point on the bank? in order to go straight across, what angle upstream should she have headed?