SOLUTION: The speed of the boat still in water is 15km/hr it needs four more hour to travel 63km against the currnet of the river than it needs to travel dowen the river determine the speed

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: The speed of the boat still in water is 15km/hr it needs four more hour to travel 63km against the currnet of the river than it needs to travel dowen the river determine the speed       Log On


   

Question 1150484: The speed of the boat still in water is 15km/hr it needs four more hour to travel 63km against the currnet of the river than it needs to travel dowen the river determine the speed of the currnet of the river

Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
--------------------------------------------------------
The speed of the boat still in water is 15km/hr it needs four more hour to travel 63km against the currnet of the river than it needs to travel dowen the river determine the speed of the currnet of the river
----------------------------------------------------------

============================================================================
The speed of a boat in still water is 15km/hr. It needs four more hours to travel 63km against the currnet of the river than it needs to travel dowen the river. Determine the speed of the currnet of the river.
============================================================================ 
               SPEED     TIME         DISTANCE

UP             15-c      63/(15-c)     63

DOWN           15+c     63/(15+c)      63

DIFFERENCE                4

Solve for c in 63%2F%2815-c%29-63%2F%2815%2Bc%29=4.

Not showing the steps here, but c=6.