jakebice5991
25.11.2020 •
Mathematics
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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Ответ:
X, in the second equation.
Step-by-step explanation: