A boat covers a certain distance downstream in I hour, while it comes back in 1½ hours. If the speed of the stream be 3 kmph. what is the speed of the boat in still water ?
Let the speed of the boat in still water be x kmph. Then,
Speed downstream = (x + 3) kmph.
Speed upstream = (x - 3) kmph.
= (x - 3)x3/2 kmph.
=> x = 15 kmph
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