Problema Solution
The speed of a motor boat in still water is 60 kph. It goes 100 kilometers up the river and then comes 100 km back in a total of 12 hours. What is the speed of the currect of the river?
Answer provided by our tutors
the currect of the river: x
So the equation is
100/(60-x) + 100/(60+x) = 12
So
x = sqrt(2600) = 50.99
So
the currect of the river is 50.99 km/h