84.
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.
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 =
|
x
|
km/hr
|
|
2
|
|
II. Speed upstream =
|
x
|
km/hr.
|
|
4
|
|
Speed
of boat in still water =
|
1
|
|
x
|
+
|
x
|
km/hr.
|
|
2
|
2
|
4
|
Thus,
I and II both even do not give the answer.
Correct
answer is (D).
