Boat And Stream Question

 

TYPE - 1

1- A man rows a boat 18 km in 4 hours down stream and
return upstream in 12 hours. The speed of the
stream ( in km/hr ) is :
(1) 1 (2) 1.5

(3) 2 (4) 1.75
2- A motorboat in still water travels at a speed of 36 km/hr.
It 56 km upstream in 1 hour 45 minutes. The time taken by
it to cover the same distance down the stream will be :

(1) 1 hour 22 mint (2) 1 hour 23 mint

(3) 1 hour 24 mint (4) 1 hour 25 mint

3- A boat rowed down a river at 21 km/hr. And rowed up
the river at 9 km/hr. What is the velocity of the stream ?
(1) 4 km/ hr (2) 5 km/ hr

(3) 6 km/ hr (4) 6.5 km/ hr

4- A swimwear can swim downstream at 14 km /hr and upstream
at 6 km /hr. What is the speed of the swimmer in still water ?
(1) 10 km/ hr (2) 9.5 km/ hr

(3) 11 km/ hr (4) 12 km/ hr

5- The speed of a boat in still water is 4 km/hr while it's speed
against the stream is 2 km/hr. What is the velocity
of the stream ?
(1) 3 km/ hr (2) 3.5 km/ hr

(3) 2.5 km/ hr (4) 2 km/ hr

6- The speed of a boatman in the direction of stream
is 15 km/hr. What is the velocity of the boat
man against the stream ?
(1) 11 km/ hr (2) 12 km/ hr

(3) 16.30 km/ hr (4) 14.75 km/ hr

7- A boat downstream cover a distance of 20 km in 2 hours
while it cover the same distance upstream in 5 hrs.
Then speed of the boat in still water is :
(1) 7 km/ hr (2) 8 km/ hr

(3) 9 km/ hr (4) 10 km/ hr

8- A man rows 40 km upstream in 8 hours and a
distance of 36 km downstream in 6 hours.
Then speed of stream is :

(1) 0.5 km/ hr (2) 1 km/ hr

(3) 1.5 km/ hr (4) 2 km/ hr

9- A boat goes 40 km upstream in 8 hours
and 36 km in downstream in 6 hours.
The speed of the boat in still water is :
(1) 4.5 km/ hr (2) 5.5 km/ hr

(3) 6.5 km/ hr (4) 7.5 km/ hr

10- The speed of the current is 5 km/hr . A motorboat goes 10 km
upstream and back again to the starting point in 50 minutes.
The speed ( in km / hr ) of the motorboat in still water is :
(1) 20 (2) 25

(3) 30 (4) 35

ANS-

1- 2 2- 3 3- 3 4- 1 5- 4 6- 2 7- 1 8- 1 9- 2 10-2

Type- 2 1- A boat goes 6 km an hour in still water, but
take thrice as much time in going the same
distance against the current. The speed
of the current ( in km/hr ) is :
(1) 1 (2) 2

(3) 3 (4) 4

2- A man can row 30 km downstream and return in a total
of 8 hours. If the speed of the boat in still water is four times
the speed of the current, then the speed of the current is :
(1) 4 km/ hr (2) 2 km/ hr

(3) 1 km/ hr (4) 3 km/ hr

3- A man can row at a speed of 9/2 km/hr in still water.
If he takes 2 times as long to row the same distance
downstream, then the speed of stream ( in km/hr ) is :
(1) 0.5 (2) 1

(3) 1.5 (4) 2

ANS-

1- 4 2- 2 3- 3

Type- 3 1- A man can row at 5 km/hr. in still water. If the
velocity of the current is 1 km/hr. and it takes
him 1 hour to row to a place and come back,
how far is the place ?
(1) 2.5 km (2) 2.6 km

(3) 2.7 km (4) 2.4 km

2- The speed of a motor - boat is that of the current
of water as 36:5. The boat goes along with the
current in 5 hours 10 minutes. It will
come back in :
(1) 6 hours (2) 6.30 hours

(3) 6.40 hours (4) 6.50 hours

3- A man can row 6 km/hr in still water. If the speed
of the current is 2 km/hr, takes 3 hours more in
upstream then in the downstream for the
same distance is :

(1) 20 km (2) 24 km

(3) 28 km (4) 30 km

4- Speed of a boat is 5 km/hr in still water and the
speed of the stream is 3 km/hr. If the boat takes
3 hours to go to a place and come back,
the distance of the place is :
(1) 4.8 km (2) 5.8 km

(3) 6.8 km (4) 7.8 km

5- The speed of boat along the stream is 12 km/hr
and against the stream is 8 km/hr. The time taken
by the boat to sail 24 km in still water is :

(1) 2 hours (2) 3 hours

(3) 2.4 hours (4) 1.2 hours

ANS-

1- 4 2-4 3-2 4-1 5-3

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