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Boats and Streams

Q1:
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.

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

ANS:E - Both I and II are necessary to answer

 I. Speed upstream = 48 km/hr = 8 km/hr.
6
II. Speed downstream = 48 km/hr = 12 km/hr.
4
Speed of the boat = 1 (8 + 12) km/hr = 10 km/hr.
2
Thus, I and II together give the answer.  Correct answer is (E).



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