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### Discussion :: Boats and Streams

1. 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.

2.  A. I alone sufficient while II alone not sufficient to answer B. II alone sufficient while I alone not sufficient to answer C. Either I or II alone sufficient to answer D. Both I and II are not sufficient to answer E. 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

Thus, I and II both even do not give the answer.

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