Maybe it's because of the awkward of this one that I'm not sure why it is what it is. I am looking at physics questions and answers but no work is shown. If someone could tell me how to set it up, I'd appreciate it: QUESTION: A river 1.00 mile wide flows with constant speed of 1.00 mi/hr. A man rows a boat 2.00 mi./hr. He crosses the river in a direction that puts him directly across the river from the starting point, and then he returns in a direction that puts him back at the starting point in the shortest time possible. The travel time for the man is: ANSWER: 1.15 hr. The way I see it, his speed is 3 miles an hour when he is going downstream (rowing speed plus river speed). However, on the return trip, since the current is moving against him at 1 mile an hour (i'm assuming this part), the speed should be reduced to 1 mile an hour. To go downstream at 3 miles an hour, it would take 20 minutes. To return to the starting point, his speed should be 1 mile an hour (since its upstream), and it should take him a full hour, for a total travel time of 80 minutes. However, 80 minutes is 1.33 hrs. Am I on the wrong track? Thanks again.