Mathematics, 25.11.2020 22:20 cammie5292

Q: It took a patrol boat 5 hours to travel 60 km up a river against the current, and 3 hours for the return trip with the current. Determine the speed of the boat in still water and the speed of the current. Let x be the speed of the boat in still water in km/hr
Let y be the speed of the current in km/hr.

*the 2 equations are x+y=20 and x-y=12 however I don’t understand why. Can someone explain?

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