A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?

One Answer on this Question

1. Let:
   1. speed of boat in still water = x
   2. speed of stream = y;

   Then net speed of boat upstream = x – y = 16km / 4 h = 4kmph
   Net speed of boat downstream = x + y = 16 / 2 = 8kmph

   Now solve for x to get x = 6kmph in still water.

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