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# A river ows with a uniform velocity v. A person in a motorboat travels 1.57 km upstream, at which time a log is seen oating by. The person continues...

A river ﬂows with a uniform velocity v. Aperson in a motorboat travels 1.57 km upstream, at which time a log is seen ﬂoating by.The person continues to travel upstream for29.5 min at the same speed and then returnsdownstream to the starting point, where thesame log is seen again.Find the ﬂow velocity of the river. Assumethe speed of the boat with respect to the wateris constant throughout the entire trip. (Hint:The time of travel of the boat after it meetsthe log equals the time of travel of the log.)Answer in units of m/s