A boat goes $30$ km downstream in $3$ hours and $30$ km upstream in $5$ hours. Speed of boat in still water is

A boat goes $30$ km downstream in $3$ hours and $30$ km upstream in $5$ hours. Speed of boat in still water is
  1. $8$ km/h
  2. $10$ km/h
  3. $6$ km/h
  4. $2$ km/h

Solution

Down speed $= 10$, up speed $= 6$. Boat $= \dfrac{10+6}{2} = 8$ km/h.

Asked in: MH-SSC-9

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