Boats and Streams - General Aptitude

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).