81.
A boat takes a total time of three hours to travel downstream from P and Q and
upstream back from Q to P. What is the speed of the boat in still water?
I.The
speed of the river current is 1 km per hour.
II. The distance between P and Q is 4 km.
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
82. A
man can row upstream at 8 kmph and downstream at 13 kmph. The speed of the
stream is:
A.)
3
B.)
5
C.)
8
D.)
9
83.The
effective speed of travel of a boat downstream is 20 kmph whereas it is 10 kmph
upstream. What is the speed of the current?
[A]
2
[C]
5
[B]
7
[D]
6
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
85.A
man can row with the stream at 7 km/hr and against the stream at 3 km/hr. His
speed in still water is:
[A]
6.5 km/hr
[C]
5 km/hr
[B]
7 km/hr
[D]
None of these
View Answer and Explanation:
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
87.A
man's speed with the current is 15 km/hr and the speed of the current is 2.5
km/hr. The man's speed against the current is:
[A]
8.5 km/hr
[C]
10 km/hr
[B]
9 km/hr
[D]
12.5 km/hr
88.
What is the speed of the boat in still water?
I.
The speed downstream is 12 kmph.
II.
The speed upstream is 4 kmph.
III. In a to and fro journey between two
points, the average speed of the boat was 6 kmph.
A. I and II only
B. All I, II and III
C. III, and either I or II
D. Any two of the three
E. None of these
89.A
man can row downstream at the rate of 15 km/hr and upstream at 10 km/hr. Find
man’s rate in still water and the rate of current?
[A]
2.5
[C]
3.5
[B]
3
[D]
6
90.A
swimmer covers a distance of 28 km against the current and 40 km in the
directions of the current. If in each case he takes 4 hours, then the speed of
the current is
[A]
3.5 km/hr
[C]
2.5 km/hr
[B]
1.5 km/hr
[D]
None of these
