SOLUTION: A RACE- BOAT COVERS A DISTANCE OF 66 KM DISTANCE DOWNSTREAM IN 110 MINUTS. IF COVERS THIS DISTANCE UPSTREAM IN 120 MINUTS. THE SPEED OF THE BOAT IN STILL WATER IS 3.45 KM/HR. FIN

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Question 934114: A RACE- BOAT COVERS A DISTANCE OF 66 KM DISTANCE DOWNSTREAM IN 110 MINUTS. IF COVERS THIS DISTANCE UPSTREAM IN 120 MINUTS. THE SPEED OF THE BOAT IN STILL WATER IS 3.45 KM/HR. FIND THE SPEED OF THE STEAM.
Answer by lwsshak3(11628) About Me  (Show Source):
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A RACE- BOAT COVERS A DISTANCE OF 66 KM DISTANCE DOWNSTREAM IN 110 MINUTES. IF COVERS THIS DISTANCE UPSTREAM IN 120 MINUTES. THE SPEED OF THE BOAT IN STILL WATER IS 3.45 KM/HR. FIND THE SPEED OF THE STREAM.
***
let x=speed of stream
(3.45+x)=speed of boat downstream
(3.45-x)=speed of boat upstream
distance/speed=travel time
..
66%2F%28%283.45%2Bx%29%29=110%2F60
66%2F%28%283.45-x%29%29=120%2F60
..
66%2F%28%283.45%2Bx%29%29=11%2F6
66%2F%28%283.45-x%29%29=2
..
66%2F%28%283.45%2Bx%29%29=11%2F6
66%2F%28%283.45-x%29%29=2
..
6(66)=11(3.45+x)
66=2(3.45-x)
..
396=37.95+11x
66=6.90-2x
..
792=75.9+22x(mult. eq by2)
726=75.9-22x(mult. eq by11)
subtract
44x=66
4x=6
x=6/4=1.5
speed of stream=1.5 km/hr