Question

pls help me with this
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Answer 1

Let the speed of the boat in still ater be x kmph 

Then Speed downstream = (x+3) kmph 

Speed upstream = (x−3) kmph

∴(x+3)×1=(x−3)×23⇒2x+6=3x−9⇒x=15 kmph

Answer 2

Hence speed of boat in still water is 31.5 km/h