86.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
Answer: Option E
Explanation:
|
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).
