Mathematics, 02.03.2021 03:40 lorrainelopez

Johnny and his father go fishing at 5:00 am. after motoring 6 km upstream, Johnny writes a letter to his friend, puts the letter in a bottle, a drops it into the river. The bottle floats in the current and reaches at 7:40 AM the point where Johnny and his father began their trip. If the speed of the boat in still water is 9km/h, what is the speed of the river current? PLS HELP

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Johnny and his father go fishing at 5:00 am. after motoring 6 km upstream, Johnny writes a letter to...