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Tina can row a boat at 2.60 mi/h in still water. She needs to cross a...

Tina can row a boat at 2.60 mi/h in still water. She needs to cross a river that is 1.20 mi wide with a current flowing at 1.90 mi/h. Not having her calculator she guesses that to go straight across she should head upstream at an angle of 25.0° from the direction straight across the river.
a. How long does it take her to cross the river?
b. What is her speed with respect to the starting point on the bank?
c. How far up or downstream from her starting point will she reach the opposite bank?
d. In order to go straight across, what angle upstream she she have headed?

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