the motorboat goes downstream and covers a distance in 4 hours while it cover the same distance upstream in 5 hours if the speed of the stream is 3 km per hour find the speed of the motor boat in still water.
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4(x+3)=5(x-3)
4x+12=5x-15
4x-5x=-15-12
-x=-27
x=27
4x+12=5x-15
4x-5x=-15-12
-x=-27
x=27
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