1.
(i) Speed of a man is 8 km/hr in still water. If the rate of the current is 3
km/h, find the effective speed of the man upstream. [Ans. (a) 5 km/hr]
(a) 5 km/hr (b) 8 km/hr
(c) 6 km/hr (d) 9 km/hr (e) None
(ii)
The speed of a boat in Still water is 2 km/hr. If its speed upstream be 1 km/hr,
then the speed of the stream is [Ans. (c) 1km/hr]
(a) 2 km/hr (b) 3 km/hr
(c) 1km/hr (d) 4 km/hr (e) None
(iii)
A boat goes 14 km upstream in 56 minutes. The speed of the stream is 2 km/hr.
The speed of boat in still water is [Ans. (d) 17 km/hr]
(a) 6 km/hr (b) 15 km/hr
(c) 14 km/hr (d)17 km/hr (e)None
(iv)
The speed of a man is 7 km/hr in still water. If the rate of the current is 2
km/hr, find the effective speed of the man upstream. [Ans. (b) 5 km/hr]
(a) 9 km/hr (b) 5 km/hr (c)14 km/hr
(d) 6 km/hr (e) None
(v) A man’s speed with the
current is 15 km/hr & the speed of the current is 2.5 km/h. The man’s speed
against the current is: [Ans. (c) 10 km/hr]
(a) 8.5 km/hr (b)9 km/hr (c)
10 km/hr (d) 12.5 km/hr (e)None
2. (i) Speed of a swimmer is 8 km/hr in still
water. If the rate of the stream is 3 km/hr, find the effective speed of the
swimmer downstream. [Ans. (b) 11 km/hr]
(a) 6 km/hr (b) 11 km/hr (c)12 km/hr
(d) 9 km/hr (e) None
(ii)
The speed of a boat in Still water is 10 km/hr .If its speed downstream be 13
km/hr , then the speed of the stream is [Ans. (b)3 km/hr]
(a)1.5 km/hr (b)3 km/hr (c)11.5 km/hr (d) 5.75 km/hr (e)none
(iii) If a man goes upstream at 6 km/hr and
the rate of the stream is 2 km/hr, then the man’s speed in still water is [Ans. (b) 8 km/hr]
(a) 4 km/hr (b) 8 km/hr (c) 2 km/hr
(d) 12 km/hr (e) None
(iv) A boat goes 12 km upstream in 48
minutes. The speed of the stream is 2 km/hr. The speed of the boat in still
water is [Ans. (c) 17 km/hr]
(a) 13 km/hr (b) 2.25 km/hr (c) 17
km/hr (d)15 km/hr (e) None
3.(i) A man can row upstream at 10 km/hr and
downstream at 16 km/hr. Find the man’s rate in still water. [Ans.(a)13 km/h]
(a) 13 km/hr (b) 18 km/hr (c) 2
km/hr (d) 6 km/hr
(e) None
(ii)
If a man row downstream at 14 km/hr and upstream at 5 km/hr, then find man’s
rate in still water. [Ans. (a) 9.5 km/hr]
(a) 9.5 km/hr (b) 8 km/hr (c)8.5 km/hr
(d) 9 km/hr (e)None
(iii) In one hour a boat goes 11 km
along the stream and 5 km against the stream. The speed of the boat in the
still water (in km/hr) is [Ans. (c) 8]
(a) 3 (b) 5 (c)
8 (d) 9 (e) None
(iv) A boat
running downstream covers a distance of 16 km in 2 hrs while for covering the
same distance upstream, it takes 4 hrs. What is the speed of the boat in still
water? [Ans. (b) 6 km/h]
(a) 4 km/hr (b) 6 km/hr (c) 8 km/hr
(d) 9 km/hr (e) None
(v)
If a man row downstream at 16 km/hr and upstream at 11 km/hr, then find man’s
rate in still water. [Ans. (b) 13.5 km/hr]
(a) 14 km/hr (b)
13.5 km/hr (c) 14.5 km/hr (d) 15.5
km/hr (e) None
(vi)
If a man rows at the rate of 5 km/hr in still water and his rate against the
current is 3.5 km/hr, then the man’s rate along
the current is [Ans. (b)6.5 km/hr]
(a)8.5 km/hr (b)6.5 km/hr (c)6 km/hr (d)4.25 km/hr
(e)None
4.(i)A
man can row upstream at 10 km/hr and downstream at 16 km/hr. Find the rate of
the current. [Ans. (a) 3 km/hr]
(a) 3 km/hr (b) 8 km/hr (c) 2 km/hr (d) 6 km/hr
(e) None
(ii)A
man can row upstream at 16 km and downstream at 27 km taking 5 hrs each time.
What is the velocity of the current? [Ans. (c) 1.1 km/hr]
(a) 2 km/hr (b) 2.1
km/hr (c) 1.1 km/hr (d) 6 km/hr (e) None
(iii)
A boat moves downstream at rate of 1 km in 7 ½ minutes and upstream at the rate
of 5 km an hour. What is the velocity of the current? [Ans. (d)1.5 km/hr]
(a)1.3 km/hr (b)1.2 km/hr (c)1.6 km/hr (d)1.5 km/hr (e)None
(iv)
A person rows a kilometer down the stream in 10 minutes and upstream in 30
minutes. Find the velocity of the stream. [Ans. (b) 2 km/hr ]
(a) 1 km/hr (b) 2 km/hr (c) 1.1 km/hr
(d) 4 km/hr (e) None
(v)
A man can row upstream at 11 km and downstream at 26 km taking 5 hrs each time.
What is the velocity of the current? [Ans. (c) 1.5 km/hr]
(a) 1 km/hr (b) 1.3 km/hr (c) 1.5 km/hr (d) 2.5 km/hr (e)None
5.
(i) The speed of a boat in Still water is 8 km/hr and the rate of the current
is 4 km/hr. Find the distance travel downstream and upstream in 5 minutes. [Ans. (d) 1 km, 1/3 km]
(a)2 km, ½ km (b)3 km, 2 km
(c)5 km, 4 km (d) 1 km, 1/3 km]
(ii)
The speed of a boat in Still water is 15 km/hr and the rate of the current is 3
km/hr. The distance travelled downstream in 12 minutes is. [Ans. (a) 3.6 km]
(a) 3.6 km (b) 2.4 km (c) 1.2 km
(d) 1.8 km (e) None
(iii) A boat man goes 2 km against the
current of the stream in 1 hour and goes 1 km along the current in 10 minutes.
How long will it take to go 5 km in stationary water? [Ans. (c)1 hr 15 min]
(a)40 minutes (b)1 hr (c)1
hr 15 min (d)1 hr 30 min (e)None
(iv)
The speed of a boat in Still water is 15 km/hr and the rate of the current is
13 km/hr. The distance travelled downstream in 15 minutes is. [Ans. (a) 7 km]
(a) 7 km (b) 8 km
(c) 7.5 km (d) 7.6 km (e) None
(v)
A person can swim in still water at 4 km/hr. If the speed of the water is 2
km/hr, how many hours will the man take to swim back against the current for 6
km? [Ans.
(a) 3]
(a) 3 (b) 4 (c) 4 ½ (d) 6 (e) None
(vi) A boat can travel
with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr,
find the time taken by the boat to go 68 km downstream. [Ans. (c) 4 hrs]
(a) 2 hrs (b) 3 hrs (c)
4 hrs (d) 5 hrs (e) None
(vii)
A man can row in Stillwater at 7 km/hr and the rate of stream is 3.5 km/hr. A
distance of 10.5 km in going upstream is covered in… [Ans. (c) 3 hrs]
(a) 1.5 hrs (b) 1hr (c)
3 hrs (d) 15 hrs (e) None
6.
(i) A man takes twice as long to row up as to row down the river. If the rate
of the river is 4 km/hr, find the rate of the man in still water. [Ans.(a) 12 km/hr]
(a) 12 km/hr (b) 11 km/hr
(c) 15 km/hr (d) 16 km/hr (e) None
(ii)
A man can row 4.5 km /hr in still water and he finds that it takes him twice as
long to row up as to row down the river. Find the rate of the stream. [Ans.(b) 1.5 km/hr]
(a)2 km/hr (b)1.5
km/hr (c) 2.5 km/hr (d)1.75 km/hr (e)None
(iii)
A man can row 6 km /hr in still water and he finds that it takes him twice as
long to row up as to row down the river. Find the rate of the stream. [Ans.(a) 2 km/hr]
(a) 2 km/hr (b) 3
km/hr (c) 1.5 km/hr (d) 1km/hr
(e) None
(iv) A man can row at the rate of 3.5 km/hr in
Stillwater. If the time taken tom row a certain distance upstream is 2 ½ times
as much as to row the same distance downstream, find the speed of the current. [Ans. (b) 1.5 km/hr]
(a)2.5 km/hr (b)1.5
km/hr (c) 3 km/hr (d)1.25 km/hr (e)None
(v)
A man can row 4 km /hr in still water and he finds that it takes him twice as
long to row up as to row down the river. Find the rate of the stream. [Ans. (a) (1 and 1/3)
km/hr ]
(a) (1 and 1/3)
km/hr (b)2 km/hr
(c) 1 km/hr (d)1.5 km/hr (e)
None
(vi) A man takes twice as
long to row a distance against the stream as to row the same distance in favour
of the stream. The ratio of the speed of the boat (in still water) and the
stream is: [Ans. (b) 3 : 1]
(a) 2 : 1 (b) 3 : 1 (c) 3 : 2 (d) 4 : 3 (e) None
(vii) A boat running
upstream takes 8 hours 48 minutes to cover a certain distance. While it takes 4
hours to cover the same distance running downstream. What is the ratio between
the speed of the boat and the speed of the water current respectively? [Ans. (c) 8 : 3]
(a) 2 : 1 (b) 3 :
2 (c) 8 : 3 (d) 4 : 2 (e) None
Sir solution given or not for above pbm
ReplyDelete