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### Discussion :: Boats and Streams

1. What is the speed of the boat in still water?

I. The boat covers a distance of 48 kms in 6 hours while running upstream.

II. The boat covers the same distance in 4 hours while running downstream.

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

Explanation :

I. Speed upstream =$$\frac {48 } { 2 }$$km/hr=8km/hrI.

IISpeed downstream =$$\frac {48 } { 4 }$$km/hr=8km/hr

Speed of the boat =$$\frac { 1 } { 2 } (8+12)$$km/hr=10km/hr

Thus, I and II together give the answer.

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