Boats and Streams - Arithmetic Aptitude Questions and Answers

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What is the speed of the boat in still water?

I. It takes 2 hours to cover the distance between A and B downstream.

II. It takes 4 hours to cover the distance between A and B upstream.

I alone sufficient while II alone not sufficient to answer

II alone sufficient while I alone not sufficient to answer

Either I or II alone sufficient to answer

Both I and II are not sufficient to answer

Both I and II are necessary to answer

Answer : Option D

Explanation :

Let AB = x km.

I. Speed downstream =	$\frac { X} { 2 }$	km/hr

II. Speed upstream = $\frac { X } { 4 }$ km/hr

Speed of boat in still water = $\frac { 1 } { 2 }$ [ $\frac { X } { 2 }$ + $\frac { X } { 4}]$ km/hr