I have a math problem I found on the internet (or maybe it's more physics, I dunno). I have a solution, but as nobody put up the correct answer, I don't know if I have it right.
So if anybody has the time and interest, here's the question, thanks for posting your answers
The Harvard bridge and the Longfellow bridge cross the Charles River in a distance of 1 mile from each other. A boat team is rowing upstream from the longfellow bridge. As the boat passes the Harvard bridge, the helmsman's hat falls into the river. After ten minutes he notices and turns around the boat immediately, letting the team row downstream with the same amount of beats per minute. When they reach the hat, they are at the Longfellow bridge again.
What speed is the river flowing at?