Posted by christine on Thursday, January 26, 2012 at 2:33am.
To go straight across, you would have to paddle in an upstream direction with respect to the water. The velocity component across the river would then be sqrt(5^2 - 3^2) = 4 miles/h. The time to go across and back is then
T1 = 2 mile/4 mph = 0.5 hours = 30 minutes
To go 1 mile upstreeam and then down requires
T2 = 1/(5-3) + 1/(5+3) = 1/2 + 1/8 = 5/8 hr = 37.5 minutes.
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