SOLUTION: A boat can travel with a speed of 15 km/hr in still water. it needs 4 more hours to travel 63km agains the current of a river than it needs to travel down the river find the speed

Question 696737: A boat can travel with a speed of 15 km/hr in still water. it needs 4 more hours to travel 63km agains the current of a river than it needs to travel down the river find the speed of the river

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the boat's time in hrs to travel 63 km downstream
Let = the speed of the current in km/hr
The boat's speed going downstream is
The boat's speed going upstream is
------------
given:
Equation for going upstream is
(1)
Equation for going downstream is
(2)
----------------------
(1)
(1)
(1)
(1)
----------------------------
Substitute (1) into (2)
(2)
(2)
(2)
(2)
(2)
Use quadratic equation:

You'll have to finish, but this is the basic idea
of how to solve. Then check the work.

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