Required information Sheena can row a boat at 2.50 mi'h in still water. She needs to cross a river that is 1.20 mi wide with a current flowing at 1.60 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head upstream at an angle of 25.0 from the direction straight across the river. What is her speed with respect to the starting point on the bank