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